Power reservation and dropping rules for transmission time intervals

ABSTRACT

Methods, systems, and devices for wireless communication are described. A user equipment (UE) may group multiple carriers with transmission time intervals (TTIs) having different durations into different physical uplink control channel (PUCCH) groups. The UE may reserve power per each PUCCH group. Alternatively, the UE may reserve power per each TTI duration across the one or more PUCCH groups.

CROSS REFERENCES

The present application for patent claims the benefit of U.S.Provisional Patent Application No. 62/543,620 by AKULA, et al., entitled“POWER RESERVATION AND DROPPING RULES FOR TRANSMISSION TIME INTERVALS,”filed Aug. 10, 2017, assigned to the assignee hereof, and expresslyincorporated by reference in its entirety.

BACKGROUND

The following relates generally to wireless communication, and morespecifically to power reservation and dropping rules for transmissiontime intervals (TTIs).

Wireless communications systems are widely deployed to provide varioustypes of communication content such as voice, video, packet data,messaging, broadcast, and so on. These systems may be capable ofsupporting communication with multiple users by sharing the availablesystem resources (e.g., time, frequency, and power). Examples of suchmultiple-access systems include fourth generation (4G) systems such as aLong Term Evolution (LTE) systems or LTE-Advanced (LTE-A) systems, andfifth generation (5G) systems which may be referred to as New Radio (NR)systems. These systems may employ technologies such as code divisionmultiple access (CDMA), time division multiple access (TDMA), frequencydivision multiple access (FDMA), orthogonal frequency division multipleaccess (OFDMA), or discrete Fourier transform-spread-OFDM (DFT-S-OFDM).

A wireless multiple-access communications system may include a number ofbase stations or network access nodes, each simultaneously supportingcommunication for multiple communication devices, which may be otherwiseknown as user equipment (UE). Some wireless communications systems maysupport communication between a UE and a base station on multipleaggregated component carriers, referred to as carrier aggregation (CA).In some cases, a UE may transmit uplink signals on different componentcarriers during TTIs having different durations. Additionally, the UEmay transmit one or more groups of uplink signals on the componentcarriers. However, in some cases, it may be challenging to allocatepower for every component carrier when different TTI durations anddifferent groups of component carriers are used, which may result in aninadequate amount of power for all TTIs of each component carrier.

SUMMARY

The described techniques relate to improved methods, systems, devices,or apparatuses that support power reservation and dropping rules fortransmission time intervals (TTIs). Generally, the described techniquesprovide for reserving power for TTIs that have different durations,where respective power reservations for different TTI durations may beused to calculate a maximum transmit power at a user equipment (UE). Forexample, TTIs of different component carriers (CCs) in a carrieraggregation (CA) configuration may be grouped together based on TTIduration, and each group of TTIs may have its own reserved powerallocation. A maximum transmit power limit may then be determined basedon a sum of the reserved powers for each of the TTI groups. Additionalpower may also be reserved to supplement the respective powerreservations for each TTI group. This additional power may be applied toany TTI group based on priority rules or based on a temporally first TTIgroup that exceeds its reserved power. The additional power may be addedto the previously reserved power allocation for that TTI group. In someexamples, the reserved power for each group of TTIs with the same TTIduration may be scaled based on a content to be transmitted on the CCswithin the group. For example, certain types of content or differentsignals may have a different priority, and the power reservation forindividual TTIs within a group of TTIs having the same TTI duration maybe based on the priority of content for each TTI.

Additionally, in case of collision between different TTIs, a prioritymay be determined for different TTI durations that collide. In suchcases, one or more symbol periods may be dropped in a lower-priorityTTI, and additional power may be allocated to a higher-priority TTI. Forexample, shorter duration TTIs may be prioritized over longer durationTTIs, such that messaging associated with the shorter duration TTIs aretransmitted while messaging associated with the longer duration TTIs isdropped. In some cases, priority may be based on a content of messagingin each TTI, where higher priority messaging is transmitted and lowerpriority messaging is dropped. In some cases, the UE may drop channelsfrom a lowest serving cell index to a highest serving cell index in apredetermined order until a total transmit power of the UE does notexceed a maximum transmit power limit.

Additionally or alternatively, different CCs may be grouped togetherbased on an association with different physical uplink control channel(PUCCH) groups, and power reservations may be configured for each PUCCHgroup. In such cases, power may be reserved for different TTI durationswithin respective PUCCH groups, based on a priority of different TTIdurations. The power reservation schemes described herein may beconfigured by a base station and may be provided to the UE viasemi-static signaling or through transmit power control mechanisms. Inthe case of a collision between two or more TTIs, a determinedhigher-priority TTI may be transmitted within a PUCCH group, while alower-priority TTI may be dropped according to a similar determinationas described above (e.g., based on a TTI length or content of the TTI).

A method of wireless communication is described. The method may includereceiving, from a base station, power reservation information for TTIsto be used with a set of CCs of a carrier aggregation (CA) mode,categorizing, by TTI duration, the TTIs of the set of CCs intorespective groups of TTIs, identifying a reserved power for eachrespective group of TTIs of the set of CCs based on the received powerreservation information, determining a maximum transmit power limitbased on a sum of the reserved powers, and transmitting during the TTIsof the set of CCs using a transmit power that is less than thedetermined maximum transmit power limit.

An apparatus for wireless communication is described. The apparatus mayinclude means for receiving, from a base station, power reservationinformation for TTIs to be used with a set of CCs of a CA mode, meansfor categorizing, by TTI duration, the TTIs of the set of CCs intorespective groups of TTIs, means for identifying a reserved power foreach respective group of TTIs of the set of CCs based on the receivedpower reservation information, means for determining a maximum transmitpower limit based on a sum of the reserved powers, and means fortransmitting during the TTIs of the set of CCs using a transmit powerthat is less than the determined maximum transmit power limit.

Another apparatus for wireless communication is described. The apparatusmay include a processor, memory in electronic communication with theprocessor, and instructions stored in the memory. The instructions maybe operable to cause the processor to receive, from a base station,power reservation information for TTIs to be used with a set of CCs of aCA mode, categorize, by TTI duration, the TTIs of the set of CCs intorespective groups of TTIs, identify a reserved power for each respectivegroup of TTIs of the set of CCs based on the received power reservationinformation, determine a maximum transmit power limit based on a sum ofthe reserved powers, and transmit during the TTIs of the set of CCsusing a transmit power that is less than the determined maximum transmitpower limit.

A non-transitory computer readable medium for wireless communication isdescribed. The non-transitory computer-readable medium may includeinstructions operable to cause a processor to receive, from a basestation, power reservation information for TTIs to be used with a set ofCCs of a CA mode, categorize, by TTI duration, the TTIs of the set ofCCs into respective groups of TTIs, identify a reserved power for eachrespective group of TTIs of the set of CCs based on the received powerreservation information, determine a maximum transmit power limit basedon a sum of the reserved powers, and transmit during the TTIs of the setof CCs using a transmit power that is less than the determined maximumtransmit power limit.

Some examples of the method, apparatuses, and non-transitorycomputer-readable medium described herein may further includeoperations, features, means, or instructions for dropping a transmissionbased on content or length of a first TTI of the TTIs and allocating thetransmit power based on the dropping.

Some examples of the method, apparatuses, and non-transitorycomputer-readable medium described herein may further includeoperations, features, means, or instructions for dropping thetransmission may be based on the content of the first TTI, and where thecontent of the first TTI includes a PUCCH, or a PUSCH with uplinkcontrol information (UCI), or a PUSCH without UCI, or a referencesignal.

Some examples of the method, apparatuses, and non-transitorycomputer-readable medium described herein may further includeoperations, features, means, or instructions for dropping thetransmission may be based on the length of the first TTI, and where thelength of the first TTI is a subframe or a slot.

Some examples of the method, apparatuses, and non-transitorycomputer-readable medium described herein may further includeoperations, features, means, or instructions for dropping at least aportion of a first TTI of the TTIs based on at least one dropping ruleand allocating the transmit power based on the dropping.

Some examples of the method, apparatuses, and non-transitorycomputer-readable medium described herein may further includeoperations, features, means, or instructions for dropping at least aportion of a first TTI of the TTIs based on a priority of contentscheduled to be transmitted in the first TTI and allocating the transmitpower based on the dropping.

Some examples of the method, apparatuses, and non-transitorycomputer-readable medium described herein may further includeoperations, features, means, or instructions for dropping at least aportion of a first TTI of the TTIs based on a duration of the first TTIand allocating the transmit power based on the dropping.

Some examples of the method, apparatuses, and non-transitorycomputer-readable medium described herein may further includeoperations, features, means, or instructions for determining firstcontent of a first control channel group scheduled to be transmittedduring a first TTI of the TTIs and second content of a second controlchannel group scheduled to be transmitted during a second TTI of theTTIs, dropping at least a portion of the first TTI or the second TTIbased on a priority of the first content and a priority of the secondcontent and allocating the transmit power based on the dropping.

Some examples of the method, apparatuses, and non-transitorycomputer-readable medium described herein may further includeoperations, features, means, or instructions for dropping at least aportion of a first TTI of the TTIs based on whether content scheduled tobe transmitted in the first TTI includes uplink control information andallocating the transmit power based on the dropping.

Some examples of the method, apparatuses, and non-transitorycomputer-readable medium described herein may further includeoperations, features, means, or instructions for dropping at least aportion of a first TTI of the TTIs based on whether a signal scheduledto be transmitted within the first TTI may be a reference signal andallocating the transmit power based on the dropping.

Some examples of the method, apparatus, and non-transitorycomputer-readable medium described above may further include processes,features, means, or instructions for receiving the power reservationinformation via semi-static signaling from the base station or via atransmit power control command from the base station. In some examplesof the method, apparatus, and non-transitory computer-readable mediumdescribed above, the semi-static signaling includes radio resourcecontrol (RRC) messaging.

In some examples of the method, apparatus, and non-transitorycomputer-readable medium described above, determining the maximumtransmit power limit includes determining a total transmit power basedon the sum of the reserved powers. Some examples of the method,apparatus, and non-transitory computer-readable medium described abovemay further include processes, features, means, or instructions foridentifying an additional reserved power indicated by the powerreservation information, where a sum of the total transmit power and theadditional reserved power may be less than or equal to the maximumtransmit power limit.

Some examples of the method, apparatus, and non-transitorycomputer-readable medium described above may further include processes,features, means, or instructions for allocating the additional reservedpower to a first TTI group of the respective groups of TTIs based on aTTI priority, where a total power of the first TTI group may be greaterthan a reserved power of the first TTI group. In some examples of themethod, apparatus, and non-transitory computer-readable medium describedabove, the TTIs of the first TTI group may have a first TTI durationthat may be shorter than a second TTI duration of another TTI.

Some examples of the method, apparatus, and non-transitorycomputer-readable medium described above may further include processes,features, means, or instructions for allocating the additional reservedpower to a first TTI group of the respective groups of TTIs, a reservedpower of the first TTI group being exceeded before other respectivegroups of TTIs exceed other respective reserved powers, where a totalpower of the first TTI group may be greater than the reserved power ofthe first TTI group.

Some examples of the method, apparatus, and non-transitorycomputer-readable medium described above may further include processes,features, means, or instructions for determining a content to betransmitted on each CC of the set of CCs and during each respectivegroup of TTIs. Some examples of the method, apparatus, andnon-transitory computer-readable medium described above may furtherinclude processes, features, means, or instructions for scaling atransmit power for each respective group of TTIs based on a priority ofthe content.

Some examples of the method, apparatus, and non-transitorycomputer-readable medium described above may further include processes,features, means, or instructions for identifying two of more CCs of theset of CCs that transmit a same content using a same TTI duration. Someexamples of the method, apparatus, and non-transitory computer-readablemedium described above may further include processes, features, means,or instructions for scaling the transmit power for the two or more CCsbased on a priority of the content. In some examples of the method,apparatus, and non-transitory computer-readable medium described above,the content includes a PUCCH, or a physical uplink shared channel(PUSCH) comprising uplink control information (UCI), or a PUSCH thatdoes not include UCI, or a sounding reference signal (SRS).

Some examples of the method, apparatus, and non-transitorycomputer-readable medium described above may further include processes,features, means, or instructions for identifying a collision between afirst TTI having a first duration and a second TTI having a secondduration to be transmitted on the set of CCs, the second duration beingless than the first duration. Some examples of the method, apparatus,and non-transitory computer-readable medium described above may furtherinclude processes, features, means, or instructions for determining apriority of the first TTI and the second TTI. Some examples of themethod, apparatus, and non-transitory computer-readable medium describedabove may further include processes, features, means, or instructionsfor dropping one or more symbol periods of the first TTI or the secondTTI having a lowest priority based on the determined priority. Someexamples of the method, apparatus, and non-transitory computer-readablemedium described above may further include processes, features, means,or instructions for allocating a reserved power to the first TTI or thesecond TTI having a highest priority based on the determined priority.

A method of wireless communication is described. The method may includeidentifying TTIs of a set of CCs of a CA mode, categorizing, by TTIduration, the TTIs of the set of CCs into respective groups of TTIs,determining a reserved power for each respective group of TTIs of theset of CCs based on the TTI duration, and transmitting, to a UE, powerreservation information that indicates the reserved power for eachrespective group of TTIs.

An apparatus for wireless communication is described. The apparatus mayinclude means for identifying TTIs of a set of CCs of a CA mode, meansfor categorizing, by TTI duration, the TTIs of the set of CCs intorespective groups of TTIs, means for determining a reserved power foreach respective group of TTIs of the set of CCs based on the TTIduration, and means for transmitting, to a UE, power reservationinformation that indicates the reserved power for each respective groupof TTIs.

Another apparatus for wireless communication is described. The apparatusmay include a processor, memory in electronic communication with theprocessor, and instructions stored in the memory. The instructions maybe operable to cause the processor to identify TTIs of a set of CCs of aCA mode, categorize, by TTI duration, the TTIs of the set of CCs intorespective groups of TTIs, determine a reserved power for eachrespective group of TTIs of the set of CCs based on the TTI duration,and transmit, to a UE, power reservation information that indicates thereserved power for each respective group of TTIs.

A non-transitory computer readable medium for wireless communication isdescribed. The non-transitory computer-readable medium may includeinstructions operable to cause a processor to identify TTIs of a set ofCCs of a CA mode, categorize, by TTI duration, the TTIs of the set ofCCs into respective groups of TTIs, determine a reserved power for eachrespective group of TTIs of the set of CCs based on the TTI duration,and transmit, to a UE, power reservation information that indicates thereserved power for each respective group of TTIs.

Some examples of the method, apparatus, and non-transitorycomputer-readable medium described above may further include processes,features, means, or instructions for transmitting the power reservationinformation to the UE via semi-static signaling or via a transmit powercontrol command. In some examples of the method, apparatus, andnon-transitory computer-readable medium described above, the semi-staticsignaling includes RRC messaging.

Some examples of the method, apparatus, and non-transitorycomputer-readable medium described above may further include processes,features, means, or instructions for determining an additional reservedpower to use by the UE when calculating a maximum transmit power limit,where a sum of the sum of the reserved powers and the additionalreserved power may be less than or equal to the maximum transmit powerlimit. Some examples of the method, apparatus, and non-transitorycomputer-readable medium described above may further include processes,features, means, or instructions for transmitting an indication of theadditional reserved power in the power reservation information.

A method of wireless communication is described. The method may includereceiving, from a base station, power reservation information for a setof CCs of a CA mode, respective CCs of the set of CCs associated with afirst PUCCH group or a second PUCCH group, identifying a reserved powerfor each of the first PUCCH group and the second PUCCH group based onthe received power reservation information, determining a maximumtransmit power limit based on a sum of the reserved powers, andtransmitting on the set of CCs using a transmit power that is less thanor equal to the determined maximum transmit power limit.

An apparatus for wireless communication is described. The apparatus mayinclude means for receiving, from a base station, power reservationinformation for a set of CCs of a CA mode, respective CCs of the set ofCCs associated with a first PUCCH group or a second PUCCH group, meansfor identifying a reserved power for each of the first PUCCH group andthe second PUCCH group based on the received power reservationinformation, means for determining a maximum transmit power limit basedon a sum of the reserved powers, and means for transmitting on the setof CCs using a transmit power that is less than or equal to thedetermined maximum transmit power limit.

Another apparatus for wireless communication is described. The apparatusmay include a processor, memory in electronic communication with theprocessor, and instructions stored in the memory. The instructions maybe operable to cause the processor to receive, from a base station,power reservation information for a set of CCs of a CA mode, respectiveCCs of the set of CCs associated with a first PUCCH group or a secondPUCCH group, identify a reserved power for each of the first PUCCH groupand the second PUCCH group based on the received power reservationinformation, determine a maximum transmit power limit based on a sum ofthe reserved powers, and transmit on the set of CCs using a transmitpower that is less than or equal to the determined maximum transmitpower limit.

A non-transitory computer readable medium for wireless communication isdescribed. The non-transitory computer-readable medium may includeinstructions operable to cause a processor to receive, from a basestation, power reservation information for a set of CCs of a CA mode,respective CCs of the set of CCs associated with a first PUCCH group ora second PUCCH group, identify a reserved power for each of the firstPUCCH group and the second PUCCH group based on the received powerreservation information, determine a maximum transmit power limit basedon a sum of the reserved powers, and transmit on the set of CCs using atransmit power that is less than or equal to the determined maximumtransmit power limit.

Some examples of the method, apparatus, and non-transitorycomputer-readable medium described above may further include processes,features, means, or instructions for receiving the power reservationinformation via semi-static signaling from the base station or via atransmit power control command from the base station. In some examplesof the method, apparatus, and non-transitory computer-readable mediumdescribed above, the semi-static signaling includes RRC messaging.

Some examples of the method, apparatus, and non-transitorycomputer-readable medium described above may further include processes,features, means, or instructions for receiving, within the powerreservation information, an indication of reserved powers for respectivegroups of TTIs to be used with the first PUCCH group and the secondPUCCH group. Some examples of the method, apparatus, and non-transitorycomputer-readable medium described above may further include processes,features, means, or instructions for determining the maximum transmitpower limit based on a sum of the reserved powers for each respectivegroup of TTIs.

Some examples of the method, apparatus, and non-transitorycomputer-readable medium described above may further include processes,features, means, or instructions for determining a content to betransmitted for the first PUCCH group and the second PUCCH group andduring each respective group of TTIs. Some examples of the method,apparatus, and non-transitory computer-readable medium described abovemay further include processes, features, means, or instructions forscaling a transmit power of the first PUCCH group or the second PUCCHgroup based on a priority of the content and a TTI duration.

Some examples of the method, apparatuses, and non-transitorycomputer-readable medium described herein may further includeoperations, features, means, or instructions for dropping a transmissionbased on content or length of a first TTI of the respective groups ofTTIs and allocating the transmit power based on the dropping.

Some examples of the method, apparatuses, and non-transitorycomputer-readable medium described herein may further includeoperations, features, means, or instructions for dropping at least aportion of a first TTI of the respective groups of TTIs based on atleast one dropping rule and allocating the transmit power based on thedropping.

Some examples of the method, apparatuses, and non-transitorycomputer-readable medium described herein may further includeoperations, features, means, or instructions for dropping at least aportion of a first TTI of the respective groups of TTIs based on apriority of content scheduled to be transmitted in the first TTI andallocating the transmit power based on the dropping.

Some examples of the method, apparatuses, and non-transitorycomputer-readable medium described herein may further includeoperations, features, means, or instructions for dropping at least aportion of a first TTI of the respective groups of TTIs based on aduration of the first TTI and allocating the transmit power based on thedropping.

Some examples of the method, apparatuses, and non-transitorycomputer-readable medium described herein may further includeoperations, features, means, or instructions for determining firstcontent of a first control channel group scheduled to be transmittedduring a first TTI of the respective groups of TTIs and second contentof a second control channel group scheduled to be transmitted during asecond TTI of the respective groups of TTIs, dropping at least a portionof the first TTI or the second TTI based on a priority of the firstcontent and a priority of the second content and allocating the transmitpower based on the dropping.

Some examples of the method, apparatus, and non-transitorycomputer-readable medium described above may further include processes,features, means, or instructions for identifying a collision between afirst TTI having a first duration and a second TTI having a secondduration to be transmitted on the set of CCs, the second duration beingless than the first duration. Some examples of the method, apparatus,and non-transitory computer-readable medium described above may furtherinclude processes, features, means, or instructions for determining apriority of the first TTI and the second TTI. Some examples of themethod, apparatus, and non-transitory computer-readable medium describedabove may further include processes, features, means, or instructionsfor dropping one or more symbol periods of the first TTI or the secondTTI having a lowest priority based on the determined priority. Someexamples of the method, apparatus, and non-transitory computer-readablemedium described above may further include processes, features, means,or instructions for allocating a reserved power to the first TTI or thesecond TTI having a highest priority based on the determined priority.

A method of wireless communication is described. The method may includeidentifying a set of CCs of a CA mode, respective CCs of the set of CCsbeing associated with a first PUCCH group or a second PUCCH group,determining a reserved power for each of the first PUCCH group and thesecond PUCCH group, and transmitting, to a UE, power reservationinformation that indicates the reserved power for each of the firstPUCCH group and the second PUCCH group.

An apparatus for wireless communication is described. The apparatus mayinclude means for identifying a set of CCs of a CA mode, respective CCsof the set of CCs being associated with a first PUCCH group or a secondPUCCH group, means for determining a reserved power for each of thefirst PUCCH group and the second PUCCH group, and means fortransmitting, to a UE, power reservation information that indicates thereserved power for each of the first PUCCH group and the second PUCCHgroup.

Another apparatus for wireless communication is described. The apparatusmay include a processor, memory in electronic communication with theprocessor, and instructions stored in the memory. The instructions maybe operable to cause the processor to identify a set of CCs of a CAmode, respective CCs of the set of CCs being associated with a firstPUCCH group or a second PUCCH group, determine a reserved power for eachof the first PUCCH group and the second PUCCH group, and transmit, to aUE, power reservation information that indicates the reserved power foreach of the first PUCCH group and the second PUCCH group.

A non-transitory computer readable medium for wireless communication isdescribed. The non-transitory computer-readable medium may includeinstructions operable to cause a processor to identify a set of CCs of aCA mode, respective CCs of the set of CCs being associated with a firstPUCCH group or a second PUCCH group, determine a reserved power for eachof the first PUCCH group and the second PUCCH group, and transmit, to aUE, power reservation information that indicates the reserved power foreach of the first PUCCH group and the second PUCCH group.

Some examples of the method, apparatus, and non-transitorycomputer-readable medium described above may further include processes,features, means, or instructions for transmitting the power reservationinformation to the UE via semi-static signaling or via a transmit powercontrol command.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 illustrates an example of a system for wireless communicationthat supports power reservation and dropping rules for transmission timeintervals (TTIs) in accordance with aspects of the present disclosure.

FIG. 2 illustrates an example of a wireless communications system thatsupports power reservation and dropping rules for TTIs in accordancewith aspects of the present disclosure.

FIGS. 3A and 3B illustrate an example of a dropping scheme in a systemthat supports power reservation and dropping rules for TTIs inaccordance with aspects of the present disclosure.

FIG. 4 illustrates an example of a process flow in a system thatsupports power reservation and dropping rules for TTIs in accordancewith aspects of the present disclosure.

FIGS. 5 through 7 show block diagrams of a device that supports powerreservation and dropping rules for TTIs in accordance with aspects ofthe present disclosure.

FIG. 8 illustrates a block diagram of a system including a userequipment (UE) that supports power reservation and dropping rules forTTIs in accordance with aspects of the present disclosure.

FIGS. 9 through 11 show block diagrams of a device that supports powerreservation and dropping rules for TTIs in accordance with aspects ofthe present disclosure.

FIG. 12 illustrates a block diagram of a system including a base stationthat supports power reservation and dropping rules for TTIs inaccordance with aspects of the present disclosure.

FIGS. 13 through 19 illustrate methods for power reservation anddropping rules for TTIs in accordance with aspects of the presentdisclosure.

DETAILED DESCRIPTION

The described techniques provide for reserving power for TTIs that havedifferent durations, where respective power reservations for differentTTI durations may be used to calculate a maximum transmit power at auser equipment (UE). In an example, TTIs of different component carriers(CCs) in a carrier aggregation (CA) configuration may be groupedtogether based on TTI duration, and each group of TTIs may have its ownreserved power allocation. Different CCs may be grouped together basedon an association with different physical uplink control channel (PUCCH)groups, and power reservations may be configured for each PUCCH group.By reserving power based on TTIs or PUCCH groups, the power may bedistributed among the different CCs or TTIs to ensure one CC or one TTIdoes not expend all of the available power. In some cases, a prioritymay be determined for different TTI durations in case of a collisionbetween the different TTIs, and one or more symbol periods may bedropped in a lower-priority TTI. Additional power may be allocated froma dropped, lower priority TTI to a higher-priority TTI. In some cases,priority may be based on a content of messaging in each TTI of acollision, where higher priority messaging is transmitted and lowerpriority messaging is dropped.

A base station may, in some examples, configure different TTIs forcommunications with a UE. For example, wireless communications in suchsystems may use TTIs having a first duration (e.g., a 1 ms TTI) inaddition to a shortened or short TTI (sTTI) having a second, shorter,duration (e.g., two orthogonal frequency-division multiplexing (OFDM)symbol periods, three OFDM symbol periods, seven OFDM symbol periods, aslot, and the like). Wireless communications using such sTTIs may beassociated with low latency between downlink and uplink transmissions.

Some wireless communications systems may support communications betweena UE and a base station on multiple aggregated CCs, a feature referredto as CA. In some cases, the base station may configure one or more(e.g., two) PUCCH groups of CCs for a UE's uplink transmissions, wheredifferent CCs within a PUCCH group may be associated with differentlength TTIs. For example, a CC of a PUCCH group may be associated withboth first duration TTIs (e.g., 1 ms) and second duration sTTIs (e.g.,two OFDM symbols). Respective PUCCH groups may include differentcombinations of TTI durations and sTTI durations.

Distributing sufficient power reservations to the different CCs or TTIsof a PUCCH group may be challenging. For example, based on a schedulingorder for the different TTI durations, some TTIs may not be accordedsufficient transmit power. In such cases, a single CC may beunintentionally allocated most or all of the available power (e.g., upto a maximum power limit) that the UE may use in a single transmission,leaving insufficient transmit power for other TTIs on other CCs.

As described herein, the UE may efficiently allocate or reserve powersuch that, if different TTI durations are used for an uplinktransmission, each TTI duration or each PUCCH group may have sufficienttransmit power. For example, the UE may use power reservation per eachPUCCH group and may reserve a subset of a total amount of power for eachPUCCH group. In such cases, the UE may use a further power reservationwithin each PUCCH group based on priority rules or based on each TTIlength. In some examples, the UE may reserve power per TTI length acrossthe different CCs (e.g., included in different PUCCH groups). Forexample, the UE may reserve a total amount of power for TTIs of the samelength regardless of PUCCH groups, and, in some examples, the totalpower may be allocated per TTI length based on the content of each CC.In some examples, the base station may signal the reserved power to theUE through semi-static or dynamic signaling.

In some cases, the base station may signal the reserved power throughsemi-static messaging (e.g., radio resource control (RRC) messaging). Insome examples, the base station may signal the reserved power in adynamic message (e.g., via transmit power control (TPC)). Additionally,the base station may implement a set of dropping rules for the UE tofollow in case of conflicts between TTI durations, and power allocationfor TTIs may be based on the dropping rules. For example, if differentlength TTIs are to be transmitted at the same time, the UE mayprioritize a shorter duration TTI and drop the rest of the TTIs (e.g.,having longer TTI durations). In cases where more than one TTI of thesame length are to be transmitted at the same time, the UE may choosewhich TTI to prioritize and drop the rest. For example, the UE maychoose which TTI to prioritize based on the data within each TTI or on adifferent factor.

Aspects of the disclosure are initially described in the context ofwireless communications systems. Examples of a dropping scheme and aprocess flow that support power reservation and dropping rules for TTIsare then described. Aspects of the disclosure are further illustrated byand described with reference to apparatus diagrams, system diagrams, andflowcharts that relate to power reservation and dropping rules fortransmission time intervals.

FIG. 1 illustrates an example of a wireless communications system 100 inaccordance with various aspects of the present disclosure. The wirelesscommunications system 100 includes base stations 105, UEs 115, and acore network 130. In some examples, the wireless communications system100 may be a Long Term Evolution (LTE) network, an LTE-Advanced (LTE-A)network, or a New Radio (NR) network. In some cases, wirelesscommunications system 100 may support enhanced broadband communications,ultra-reliable (e.g., mission critical) communications, low latencycommunications, or communications with low-cost and low-complexitydevices.

Base stations 105 may wirelessly communicate with UEs 115 via one ormore base station antennas. Base stations 105 described herein mayinclude or may be referred to by those skilled in the art as a basetransceiver station, a radio base station, an access point, a radiotransceiver, a NodeB, an eNodeB (eNB), a next-generation Node B orgiga-nodeB (either of which may be referred to as a gNB), a Home NodeB,a Home eNodeB, or some other suitable terminology. Wirelesscommunications system 100 may include base stations 105 of differenttypes (e.g., macro or small cell base stations). The UEs 115 describedherein may be able to communicate with various types of base stations105 and network equipment including macro eNBs, small cell eNBs, gNBs,relay base stations, and the like.

Each base station 105 may be associated with a particular geographiccoverage area 110 in which communications with various UEs 115 issupported. Each base station 105 may provide communication coverage fora respective geographic coverage area 110 via communication links 125,and communication links 125 between a base station 105 and a UE 115 mayutilize one or more carriers. Communication links 125 shown in wirelesscommunications system 100 may include uplink transmissions from a UE 115to a base station 105, or downlink transmissions, from a base station105 to a UE 115. Downlink transmissions may also be called forward linktransmissions while uplink transmissions may also be called reverse linktransmissions.

The geographic coverage area 110 for a base station 105 may be dividedinto sectors making up only a portion of the geographic coverage area110, and each sector may be associated with a cell. For example, eachbase station 105 may provide communication coverage for a macro cell, asmall cell, a hot spot, or other types of cells, or various combinationsthereof. In some examples, a base station 105 may be movable andtherefore provide communication coverage for a moving geographiccoverage area 110. In some examples, different geographic coverage areas110 associated with different technologies may overlap, and overlappinggeographic coverage areas 110 associated with different technologies maybe supported by the same base station 105 or by different base stations105. The wireless communications system 100 may include, for example, aheterogeneous LTE/LTE-A or NR network in which different types of basestations 105 provide coverage for various geographic coverage areas 110.

The term “cell” refers to a logical communication entity used forcommunication with a base station 105 (e.g., over a carrier), and may beassociated with an identifier for distinguishing neighboring cells(e.g., a physical cell identifier (PCID), a virtual cell identifier(VCID)) operating via the same or a different carrier. In some examples,a carrier may support multiple cells, and different cells may beconfigured according to different protocol types (e.g., machine-typecommunication (MTC), narrowband Internet-of-Things (NB-IoT), enhancedmobile broadband (eMBB), or others) that may provide access fordifferent types of devices. In some cases, the term “cell” may refer toa portion of a geographic coverage area 110 (e.g., a sector) over whichthe logical entity operates.

UEs 115 may be dispersed throughout the wireless communications system100, and each UE 115 may be stationary or mobile. A UE 115 may also bereferred to as a mobile device, a wireless device, a remote device, ahandheld device, or a subscriber device, or some other suitableterminology, where the “device” may also be referred to as a unit, astation, a terminal, or a client. A UE 115 may be a personal electronicdevice such as a cellular phone, a personal digital assistant (PDA), atablet computer, a laptop computer, or a personal computer. In someexamples, a UE 115 may also refer to a wireless local loop (WLL)station, an Internet of Things (IoT) device, an Internet of Everything(IoE) device, or an MTC device, or the like, which may be implemented invarious articles such as appliances, vehicles, meters, or the like.

Some UEs 115, such as MTC or IoT devices, may be low cost or lowcomplexity devices, and may provide for automated communication betweenmachines (e.g., via Machine-to-Machine (M2M) communication). M2Mcommunication or MTC may refer to data communication technologies thatallow devices to communicate with one another or a base station 105without human intervention. In some examples, M2M communication or MTCmay include communications from devices that integrate sensors or metersto measure or capture information and relay that information to acentral server or application program that can make use of theinformation or present the information to humans interacting with theprogram or application. Some UEs 115 may be designed to collectinformation or enable automated behavior of machines. Examples ofapplications for MTC devices include smart metering, inventorymonitoring, water level monitoring, equipment monitoring, healthcaremonitoring, wildlife monitoring, weather and geological eventmonitoring, fleet management and tracking, remote security sensing,physical access control, and transaction-based business charging.

Some UEs 115 may be configured to employ operating modes that reducepower consumption, such as half-duplex communications (e.g., a mode thatsupports one-way communication via transmission or reception, but nottransmission and reception simultaneously). In some examples half-duplexcommunications may be performed at a reduced peak rate. Other powerconservation techniques for UEs 115 include entering a power saving“deep sleep” mode when not engaging in active communications, oroperating over a limited bandwidth (e.g., according to narrowbandcommunications). In some cases, UEs 115 may be designed to supportcritical functions (e.g., mission critical functions), and a wirelesscommunications system 100 may be configured to provide ultra-reliablecommunications for these functions.

In some cases, a UE 115 may also be able to communicate directly withother UEs 115 (e.g., using a peer-to-peer (P2P) or device-to-device(D2D) protocol). One or more of a group of UEs 115 utilizing D2Dcommunications may be within the geographic coverage area 110 of a basestation 105. Other UEs 115 in such a group may be outside the geographiccoverage area 110 of a base station 105, or be otherwise unable toreceive transmissions from a base station 105. In some cases, groups ofUEs 115 communicating via D2D communications may utilize a one-to-many(1:M) system in which each UE 115 transmits to every other UE 115 in thegroup. In some cases, a base station 105 facilitates the scheduling ofresources for D2D communications. In other cases, D2D communications arecarried out between UEs 115 without the involvement of a base station105.

Base stations 105 may communicate with the core network 130 and with oneanother. For example, base stations 105 may interface with the corenetwork 130 through backhaul links 132 (e.g., via an S1 or otherinterface). Base stations 105 may communicate with one another overbackhaul links 134 (e.g., via an X2 or other interface) either directly(e.g., directly between base stations 105) or indirectly (e.g., via corenetwork 130).

The core network 130 may provide user authentication, accessauthorization, tracking, Internet Protocol (IP) connectivity, and otheraccess, routing, or mobility functions. The core network 130 may be anevolved packet core (EPC), which may include at least one mobilitymanagement entity (MME), at least one serving gateway (S-GW), and atleast one Packet Data Network (PDN) gateway (P-GW). The MME may managenon-access stratum (e.g., control plane) functions such as mobility,authentication, and bearer management for UEs 115 served by basestations 105 associated with the EPC. User IP packets may be transferredthrough the S-GW, which itself may be connected to the P-GW. The P-GWmay provide IP address allocation as well as other functions. The P-GWmay be connected to the network operators IP services. The operators IPservices may include access to the Internet, Intranet(s), an IPMultimedia Subsystem (IMS), or a Packet-Switched (PS) Streaming Service.

At least some of the network devices, such as a base station 105, mayinclude subcomponents such as an access network entity, which may be anexample of an access node controller (ANC). Each access network entitymay communicate with UEs 115 through a number of other access networktransmission entities, which may be referred to as a radio head, a smartradio head, or a transmission/reception point (TRP). In someconfigurations, various functions of each access network entity or basestation 105 may be distributed across various network devices (e.g.,radio heads and access network controllers) or consolidated into asingle network device (e.g., a base station 105).

Wireless communications system 100 may operate using one or morefrequency bands, typically in the range of 300 MHz to 300 GHz.Generally, the region from 300 MHz to 3 GHz is known as the ultra-highfrequency (UHF) region or decimeter band, since the wavelengths rangefrom approximately one decimeter to one meter in length. UHF waves maybe blocked or redirected by buildings and environmental features.However, the waves may penetrate structures sufficiently for a macrocell to provide service to UEs 115 located indoors. Transmission of UHFwaves may be associated with smaller antennas and shorter range (e.g.,less than 100 km) compared to transmission using the smaller frequenciesand longer waves of the high frequency (HF) or very high frequency (VHF)portion of the spectrum below 300 MHz.

Wireless communications system 100 may also operate in a super highfrequency (SHF) region using frequency bands from 3 GHz to 30 GHz, alsoknown as the centimeter band. The SHF region includes bands such as the5 GHz industrial, scientific, and medical (ISM) bands, which may be usedopportunistically by devices that can tolerate interference from otherusers.

Wireless communications system 100 may also operate in an extremely highfrequency (EHF) region of the spectrum (e.g., from 30 GHz to 300 GHz),also known as the millimeter band. In some examples, wirelesscommunications system 100 may support millimeter wave (mmW)communications between UEs 115 and base stations 105, and EHF antennasof the respective devices may be even smaller and more closely spacedthan UHF antennas. In some cases, this may facilitate use of antennaarrays within a UE 115. However, the propagation of EHF transmissionsmay be subject to even greater atmospheric attenuation and shorter rangethan SHF or UHF transmissions. Techniques disclosed herein may beemployed across transmissions that use one or more different frequencyregions, and designated use of bands across these frequency regions maydiffer by country or regulating body.

In some cases, wireless communications system 100 may utilize bothlicensed and unlicensed radio frequency spectrum bands. For example,wireless communications system 100 may employ License Assisted Access(LAA), LTE-Unlicensed (LTE-U) radio access technology, or NR technologyin an unlicensed band such as the 5 GHz ISM band. When operating inunlicensed radio frequency spectrum bands, wireless devices such as basestations 105 and UEs 115 may employ listen-before-talk (LBT) proceduresto ensure a frequency channel is clear before transmitting data. In somecases, operations in unlicensed bands may be based on a CA configurationin conjunction with CCs operating in a licensed band (e.g., LAA).Operations in unlicensed spectrum may include downlink transmissions,uplink transmissions, peer-to-peer transmissions, or a combination ofthese. Duplexing in unlicensed spectrum may be based on frequencydivision duplexing (FDD), time division duplexing (TDD), or acombination of both.

In some examples, base station 105 or UE 115 may be equipped withmultiple antennas, which may be used to employ techniques such astransmit diversity, receive diversity, multiple-input multiple-output(MIMO) communications, or beamforming. For example, wirelesscommunication system may use a transmission scheme between atransmitting device (e.g., a base station 105) and a receiving device(e.g., a UE 115), where the transmitting device is equipped withmultiple antennas and the receiving devices are equipped with one ormore antennas. MIMO communications may employ multipath signalpropagation to increase the spectral efficiency by transmitting orreceiving multiple signals via different spatial layers, which may bereferred to as spatial multiplexing. The multiple signals may, forexample, be transmitted by the transmitting device via differentantennas or different combinations of antennas. Likewise, the multiplesignals may be received by the receiving device via different antennasor different combinations of antennas. Each of the multiple signals maybe referred to as a separate spatial stream, and may carry bitsassociated with the same data stream (e.g., the same codeword) ordifferent data streams. Different spatial layers may be associated withdifferent antenna ports used for channel measurement and reporting. MIMOtechniques include single-user MIMO (SU-MIMO) where multiple spatiallayers are transmitted to the same receiving device, and multiple-userMIMO (MU-MIMO) where multiple spatial layers are transmitted to multipledevices.

Beamforming, which may also be referred to as spatial filtering,directional transmission, or directional reception, is a signalprocessing technique that may be used at a transmitting device or areceiving device (e.g., a base station 105 or a UE 115) to shape orsteer an antenna beam (e.g., a transmit beam or receive beam) along aspatial path between the transmitting device and the receiving device.Beamforming may be achieved by combining the signals communicated viaantenna elements of an antenna array such that signals propagating atparticular orientations with respect to an antenna array experienceconstructive interference while others experience destructiveinterference. The adjustment of signals communicated via the antennaelements may include a transmitting device or a receiving deviceapplying certain amplitude and phase offsets to signals carried via eachof the antenna elements associated with the device. The adjustmentsassociated with each of the antenna elements may be defined by abeamforming weight set associated with a particular orientation (e.g.,with respect to the antenna array of the transmitting device orreceiving device, or with respect to some other orientation).

In one example, a base station 105 may use multiple antennas or antennaarrays to conduct beamforming operations for directional communicationswith a UE 115. For instance, some signals (e.g. synchronization signals,reference signals, beam selection signals, or other control signals) maybe transmitted by a base station 105 multiple times in differentdirections, which may include a signal being transmitted according todifferent beamforming weight sets associated with different directionsof transmission. Transmissions in different beam directions may be usedto identify (e.g., by the base station 105 or a receiving device, suchas a UE 115) a beam direction for subsequent transmission and/orreception by the base station 105. Some signals, such as data signalsassociated with a particular receiving device, may be transmitted by abase station 105 in a single beam direction (e.g., a directionassociated with the receiving device, such as a UE 115). In someexamples, the beam direction associated with transmissions along asingle beam direction may be determined based at least in in part on asignal that was transmitted in different beam directions. For example, aUE 115 may receive one or more of the signals transmitted by the basestation 105 in different directions, and the UE 115 may report to thebase station 105 an indication of the signal it received with a highestsignal quality, or an otherwise acceptable signal quality. Althoughthese techniques are described with reference to signals transmitted inone or more directions by a base station 105, a UE 115 may employsimilar techniques for transmitting signals multiple times in differentdirections (e.g., for identifying a beam direction for subsequenttransmission or reception by the UE 115), or transmitting a signal in asingle direction (e.g., for transmitting data to a receiving device).

A receiving device (e.g., a UE 115, which may be an example of a mmWreceiving device) may try multiple receive beams when receiving varioussignals from the base station 105, such as synchronization signals,reference signals, beam selection signals, or other control signals. Forexample, a receiving device may try multiple receive directions byreceiving via different antenna subarrays, by processing receivedsignals according to different antenna subarrays, by receiving accordingto different receive beamforming weight sets applied to signals receivedat a plurality of antenna elements of an antenna array, or by processingreceived signals according to different receive beamforming weight setsapplied to signals received at a plurality of antenna elements of anantenna array, any of which may be referred to as “listening” accordingto different receive beams or receive directions. In some examples areceiving device may use a single receive beam to receive along a singlebeam direction (e.g., when receiving a data signal). The single receivebeam may be aligned in a beam direction determined based on listeningaccording to different receive beam directions (e.g., a beam directiondetermined to have a highest signal strength, highest signal-to-noiseratio, or otherwise acceptable signal quality based on listeningaccording to multiple beam directions).

In some cases, the antennas of a base station 105 or UE 115 may belocated within one or more antenna arrays, which may support MIMOoperations, or transmit or receive beamforming. For example, one or morebase station antennas or antenna arrays may be co-located at an antennaassembly, such as an antenna tower. In some cases, antennas or antennaarrays associated with a base station 105 may be located in diversegeographic locations. A base station 105 may have an antenna array witha number of rows and columns of antenna ports that the base station 105may use to support beamforming of communications with a UE 115.Likewise, a UE 115 may have one or more antenna arrays that may supportvarious MIMO or beamforming operations.

In some cases, wireless communications system 100 may be a packet-basednetwork that operate according to a layered protocol stack. In the userplane, communications at the bearer or Packet Data Convergence Protocol(PDCP) layer may be IP-based. A Radio Link Control (RLC) layer may insome cases perform packet segmentation and reassembly to communicateover logical channels. A Medium Access Control (MAC) layer may performpriority handling and multiplexing of logical channels into transportchannels. The MAC layer may also use hybrid automatic repeat request(HARQ) to provide retransmission at the MAC layer to improve linkefficiency. In the control plane, the RRC protocol layer may provideestablishment, configuration, and maintenance of an RRC connectionbetween a UE 115 and a base station 105 or core network 130 supportingradio bearers for user plane data. At the Physical (PHY) layer,transport channels may be mapped to physical channels.

In some cases, UEs 115 and base stations 105 may support retransmissionsof data to increase the likelihood that data is received successfully.HARQ feedback is one technique of increasing the likelihood that data isreceived correctly over a communication link 125. HARQ may include acombination of error detection (e.g., using a cyclic redundancy check(CRC)), forward error correction (FEC), and retransmission (e.g.,automatic repeat request (ARQ)). HARQ may improve throughput at the MAClayer in poor radio conditions (e.g., signal-to-noise conditions). Insome cases, a wireless device may support same-slot HARQ feedback, wherethe device may provide HARQ feedback in a specific slot for datareceived in a previous symbol in the slot. In other cases, the devicemay provide HARQ feedback in a subsequent slot, or according to someother time interval.

Time intervals in LTE or NR may be expressed in multiples of a basictime unit, which may, for example, refer to a sampling period of T_(s)=1/30,720,000 seconds. Time intervals of a communications resource may beorganized according to radio frames each having a duration of 10milliseconds (ms), where the frame period may be expressed asT_(f)=307,200 T_(s). The radio frames may be identified by a systemframe number (SFN) ranging from 0 to 1023. Each frame may include 10subframes numbered from 0 to 9, and each subframe may have a duration of1 ms. A subframe may be further divided into 2 slots each having aduration of 0.5 ms, and each slot may contain 6 or 7 modulation symbolperiods (e.g., depending on the length of the cyclic prefix prepended toeach symbol period). Excluding the cyclic prefix, each symbol period maycontain 2048 sampling periods. In some cases a subframe may be thesmallest scheduling unit of the wireless communications system 100, andmay be referred to as a TTI. In other cases, a smallest scheduling unitof the wireless communications system 100 may be shorter than a subframeor may be dynamically selected (e.g., in bursts of sTTIs or in selectedcomponent carriers using sTTIs).

In some wireless communications systems, a slot may further be dividedinto multiple mini-slots containing one or more symbols. In someinstances, a symbol of a mini-slot or a mini-slot may be the smallestunit of scheduling. Each symbol may vary in duration depending on thesubcarrier spacing or frequency band of operation, for example. Further,some wireless communications systems may implement slot aggregation inwhich multiple slots or mini-slots are aggregated together and used forcommunication between a UE 115 and a base station 105.

The term “carrier” refers to a set of radio frequency spectrum resourceshaving a defined physical layer structure for supporting communicationsover a communication link 125. For example, a carrier of a communicationlink 125 may include a portion of a radio frequency spectrum band thatis operated according to physical layer channels for a given radioaccess technology. Each physical layer channel may carry user data,control information, or other signaling. A carrier may be associatedwith a pre-defined frequency channel (e.g., an E-UTRA absolute radiofrequency channel number (EARFCN)), and may be positioned according to achannel raster for discovery by UEs 115. Carriers may be downlink oruplink (e.g., in an FDD mode), or be configured to carry downlink anduplink communications (e.g., in a TDD mode). In some examples, signalwaveforms transmitted over a carrier may be made up of multiplesub-carriers (e.g., using multi-carrier modulation (MCM) techniques suchas OFDM or DFT-s-OFDM).

The organizational structure of the carriers may be different fordifferent radio access technologies (e.g., LTE, LTE-A, NR, etc.). Forexample, communications over a carrier may be organized according toTTIs or slots, each of which may include user data as well as controlinformation or signaling to support decoding the user data. A carriermay also include dedicated acquisition signaling (e.g., synchronizationsignals or system information, etc.) and control signaling thatcoordinates operation for the carrier. In some examples (e.g., in acarrier aggregation configuration), a carrier may also have acquisitionsignaling or control signaling that coordinates operations for othercarriers.

Physical channels may be multiplexed on a carrier according to varioustechniques. A physical control channel and a physical data channel maybe multiplexed on a downlink carrier, for example, using time divisionmultiplexing (TDM) techniques, frequency division multiplexing (FDM)techniques, or hybrid TDM-FDM techniques. In some examples, controlinformation transmitted in a physical control channel may be distributedbetween different control regions in a cascaded manner (e.g., between acommon control region or common search space and one or more UE-specificcontrol regions or UE-specific search spaces).

A carrier may be associated with a particular bandwidth of the radiofrequency spectrum, and in some examples the carrier bandwidth may bereferred to as a “system bandwidth” of the carrier or the wirelesscommunications system 100. For example, the carrier bandwidth may be oneof a number of predetermined bandwidths for carriers of a particularradio access technology (e.g., 1.4, 3, 5, 10, 15, 20, 40, or 80 MHz). Insome examples, each served UE 115 may be configured for operating overportions or all of the carrier bandwidth. In other examples, some UEs115 may be configured for operation using a narrowband protocol typethat is associated with a predefined portion or range (e.g., set ofsubcarriers or RBs) within a carrier (e.g., “in-band” deployment of anarrowband protocol type).

In a system employing MCM techniques, a resource element may consist ofone symbol period (e.g., a duration of one modulation symbol) and onesubcarrier, where the symbol period and subcarrier spacing are inverselyrelated. The number of bits carried by each resource element may dependon the modulation scheme (e.g., the order of the modulation scheme).Thus, the more resource elements that a UE 115 receives and the higherthe order of the modulation scheme, the higher the data rate may be forthe UE 115. In MIMO systems, a wireless communications resource mayrefer to a combination of a radio frequency spectrum resource, a timeresource, and a spatial resource (e.g., spatial layers), and the use ofmultiple spatial layers may further increase the data rate forcommunications with a UE 115.

Devices of the wireless communications system 100 (e.g., base stations105 or UEs 115) may have a hardware configuration that supportscommunications over a particular carrier bandwidth, or may beconfigurable to support communications over one of a set of carrierbandwidths. In some examples, the wireless communications system 100 mayinclude base stations 105 and/or UEs that can support simultaneouscommunications via carriers associated with more than one differentcarrier bandwidth.

Wireless communications system 100 may support communication with a UE115 on multiple cells or carriers, a feature which may be referred to asCA or multi-carrier operation. A UE 115 may be configured with multipledownlink CCs and one or more uplink CCs according to a carrieraggregation configuration. Carrier aggregation may be used with both FDDand TDD component carriers.

In some cases, wireless communications system 100 may utilize enhancedCCs (eCCs). An eCC may be characterized by one or more featuresincluding wider carrier or frequency channel bandwidth, shorter symbolduration, shorter TTI duration, or modified control channelconfiguration. In some cases, an eCC may be associated with a carrieraggregation configuration or a dual connectivity configuration (e.g.,when multiple serving cells have a suboptimal or non-ideal backhaullink). An eCC may also be configured for use in unlicensed spectrum orshared spectrum (e.g., where more than one operator is allowed to usethe spectrum). An eCC characterized by wide carrier bandwidth mayinclude one or more segments that may be utilized by UEs 115 that arenot capable of monitoring the whole carrier bandwidth or are otherwiseconfigured to use a limited carrier bandwidth (e.g., to conserve power).

In some cases, an eCC may utilize a different symbol duration than otherCCs, which may include use of a reduced symbol duration as compared withsymbol durations of the other CCs. A shorter symbol duration may beassociated with increased spacing between adjacent subcarriers. Adevice, such as a UE 115 or base station 105, utilizing eCCs maytransmit wideband signals (e.g., according to frequency channel orcarrier bandwidths of 20, 40, 60, 80 MHz, etc.) at reduced symboldurations (e.g., 16.67 microseconds). A TTI in eCC may consist of one ormultiple symbol periods. In some cases, the TTI duration (that is, thenumber of symbol periods in a TTI) may be variable.

Wireless communications systems such as an NR system may utilize anycombination of licensed, shared, and unlicensed spectrum bands, amongothers. The flexibility of eCC symbol duration and subcarrier spacingmay allow for the use of eCC across multiple spectrums. In someexamples, NR shared spectrum may increase spectrum utilization andspectral efficiency, specifically through dynamic vertical (e.g., acrossfrequency) and horizontal (e.g., across time) sharing of resources.

Uplink power control may include a combination of open-loop andclosed-loop mechanisms. In open-loop power control, a UE transmit powermay depend on estimates of the downlink path-loss and channelconfiguration. In closed-loop power control, the network may directlycontrol the UE transmit power using explicit power-control commands.Open-loop power control may be used for initial access, such as thetransmission of a physical random access channel (PRACH) by a UE 115,whereas both open and closed loop control may be used for uplink controland data transmission. A UE 115 may determine power using an algorithmthat takes into account a maximum transmission power limit, a targetbase station receive power, path loss, modulation and coding scheme(MCS), the number of resources used for transmission, and a format ofthe transmitted data (e.g., PUCCH format). Power adjustments may be madeby a base station 105 using TPC messages, which may incrementally adjustthe transmit power of the UE 115 as appropriate. Additionally, asdescribed herein, power control may be semi-statically managed by thebase station 105, or the UE 115 may implement rules for dropping certaintransmissions (e.g., based on content or a length of a TTI) to furtherenhance control of the UE transmit power.

In wireless communications system 100, a UE 115 may simultaneouslycommunicate on multiple carriers using TTIs having different durations(e.g., multiple CCs in a CA mode). In some cases, the UE 115 may groupthe multiple carriers with TTIs having different durations intodifferent uplink groups (e.g., PUCCH groups), where the TTIs havingdifferent durations may include TTIs of a first duration (e.g., 1 ms)and sTTIs that consist of one or more OFDM symbols (e.g., two, three, orseven symbols). The uplink or PUCCH groups may include differentcombinations of TTIs and sTTIs (e.g., different TTI and sTTI durations).Additionally, CCs in each PUCCH groups may include different types ofuplink data (e.g., PUCCH messages, physical uplink shared channel(PUSCH) messages, sounding reference signals (SRSs), uplink controlinformation (UCI), etc.). In some cases, one or more CCs may utilize allof the available power allocated for uplink transmissions, which mayresult in no power being available for the remaining CCs.

Wireless communications system 100 may support power reservations forTTIs having different durations, where respective power reservations fordifferent TTI durations may be used to calculate a maximum transmitpower at the UE 115. For example, TTIs of different CCs may be groupedtogether based on TTI duration, and each group of TTIs with the sameduration may have its own reserved power allocation. A maximum transmitpower limit may then be determined based on a sum of the reserved powersfor each of TTIs groups. Additional power may also be reserved tosupplement the respective power reservations for each TTI group. Thisadditional power may be applied to any TTI group based on priority rulesor based on a temporally first TTI group to exceed its allocated power.In some examples, the reserved power for each group of TTIs with thesame TTI duration may be scaled based on a content to be transmitted onthe CCs during the TTIs of different durations. For example, certaintypes of content or different signals may have a different priority, andthe power reservation for the TTIs (and CCs) carrying higher prioritycontent. Additionally, in case of collision between a first TTI and asecond TTI, a priority may be determined for one of the first or secondTTIs (e.g., based on a TTI duration or TTI content). In such cases, oneor more symbol periods may be dropped in a lower-priority TTI, andadditional power may be allocated to a higher-priority TTI.

Additionally or alternatively, different CCs may be grouped togetherbased on an association with different PUCCH groups, and powerreservations may be configured for each PUCCH group. In such cases,power may also be reserved for different TTI durations within respectivePUCCH groups, which may further take a priority of different TTIdurations. The power reservation schemes described herein may beconfigured by a base station 105 and provided to the UE 115 viasemi-static signaling or through TPC mechanisms.

FIG. 2 illustrates an example of a wireless communications system 200that supports power reservation and dropping rules for TTIs inaccordance with various aspects of the present disclosure. In someexamples, wireless communications system 200 may implement aspects ofwireless communications system 100. Wireless communications system 200may include base station 105-a and UE 115-a, which may be examples ofcorresponding base stations 105 and UEs 115 as described with referenceto FIG. 1. In some examples, base station 105-a may be in communicationwith one or more UEs 115 within geographic coverage area 110-a. Wirelesscommunications system 200 may illustrate PUCCH group scheduling by basestation 105-a based on UE 115-a transmitting one or more PUCCH groupscontaining different length TTIs, where power may be reserved fordifferent groups of TTIs or for different PUCCH groups.

UE 115-a may send uplink transmissions to base station 105-a over uplinkcommunication link 205. Similarly, base station 105-a may send downlinktransmissions to UE 115-a over downlink communication link 210. Wirelesscommunications system 200 may support carrier aggregation, and basestation 105-a may communicate with UE 115-a on resources of multiplecarriers on uplink communications link 205. In some cases, wirelesscommunications system 200 may support different TTI configurations 215for communications data sent over uplink communications link 205 anddownlink communications link 210. For example, TTI configuration 215 maybe an example of an allocation of time-frequency resources forcommunications between UE 115-a and base station 105-a over uplinkcommunications link 205.

TTI configuration 215 may include various configurations for TTIsutilized for transmitting data, control information, and referencesignals during a TTI 220 (e.g., a legacy TTI, a subframe, a 1 ms TTI,etc.) consisting of multiple (e.g., 14) OFDM symbol periods 225. TTIconfiguration 215 may include a configuration of multiple sTTIs 230,including, for example, sTTIs 230-a having a duration of two symbolperiods 225 or sTTIs 230-b having a duration of seven symbol periods225. It is noted that an sTTI 230 described herein may be of anyduration less than TTI 220, including the examples of the two-symbol andseven-symbol sTTIs 230. In some examples, communications between UE115-a and base station 105-b may utilize groups (e.g., PUCCH groups) ofone or a combination of TTIs having different durations for uplinktransmissions over uplink communications link 205. For example, a PUCCHgroup may include a combination of TTIs 220 and sTTIs 230-a or acombination of TTIs 220 and sTTIs 230-b. For example, a first PUCCHgroup may include a combination of two TTIs 220 and four sTTIs 230-a,and a second PUCCH group may include a combination of one TTI 220 andthree sTTIs 230-b. UE 115-a may need to transmit both PUCCH groups tobase station 105-a over uplink communications link 205. However, whenscheduling power control information, power may be allocated accordingto TTI length (i.e., TTIs 220 may be scheduled first, sTTIs 230-b may bescheduled next, and sTTIs 230-a may be scheduled last). In some cases,each TTI 220, sTTI 230-a, and sTTI 230-b may correspond to a differentCC in a CA configuration, which may include different uplink data ineach CC (e.g., PUCCH message, PUSCH message, SRS, UCI, etc.). As such,CCs with a length of TTI 220 may utilize an amount of power such thatnot enough power is available for CCs with a length of sTTIs 230-b orsTTIs 230-a.

Base station 105-a may transmit power reservation information to UE115-a on downlink communications link 210 so that power may be allocatedfor each TTI 220 or sTTI 230 for CCs of both PUCCH groups. In somecases, the power reservation information may include reserved powers foreach PUCCH group. UE 115-a may then allocate the power reserved for eachCC within each PUCCH group based on priority rules or based on furtherpower reservation for each TTI length within the PUCCH group. Thepriority rules may include assigning a higher priority for differenttypes of uplink data (e.g., PUCCH has a higher priority than PUSCH withUCI, PUSCH with UCI has a higher priority than PUSCH without UCI, andPUSCH without UCI has a higher priority than SRS, etc.). Alternatively,the power reservation information may include reserved powers for eachTTI length (e.g., TTIs 220, sTTIs 230-a, and sTTIs 230-b).

When the power reservation information includes reserved powers based onTTI length, the power reservation may include a total amount of powerfor TTIs with a same length that may span across one or more PUCCHgroups. For example, the total power may be defined as:P _(1msec) +P _(2os) +P _(7os) =P _(total) ≥P _(C) _(max) −Δ  (1)where P_(1msec) corresponds to a total power for TTIs 220 (e.g., a 1 msTTI), P_(2os) corresponds to a total power for sTTIs 230-a having aduration of two OFDM symbols 225, P_(7os) corresponds to a total powerfor sTTIs 230-b having a duration of seven OFDM symbols 225, P_(total)corresponds to a total amount of power for uplink transmissions, P_(C)_(MAX) corresponds to a maximum transmit power limit used for uplinktransmissions, and Δ corresponds to extra power reserved. It isunderstood that TTIs of different length may also be used for suchcalculations, using corresponding power reservation values.

As described above, a first PUCCH group may include a combination of twoTTIs 220 and four sTTIs 230-a, and a second PUCCH group may include acombination of one TTI 220 and three sTTIs 230-b. In such an example,three CCs may have a length of TTI 220 (e.g., two CCs from the firstPUCCH group and one CC from the second PUCCH group), four CCs may have alength of sTTI 230-a (e.g., four CCs in the first PUCCH group), andthree CCs may have a length of sTTI 230-b (e.g., three CCs in the secondPUCCH group). The UE 115-a may allocate the total reserved power foreach TTI length (i.e., P_(1msec), P_(2os), P_(7os)) for each CC withinits respective TTI length such that the sum of the allocated powers forthe CCs equals the total reserved power for the TTI length. For example,the total reserved power for TTIs 220 may be defined as:P _(a) +P _(b) +P _(c) =P _(1msec)  (2)where P_(a) corresponds to an allocated power for a first CC with alength TTI 220 in the first PUCCH group, P_(b) corresponds to anallocated power for a second CC with a length TTI 220 in the first PUCCHgroup, and P_(c) corresponds to an allocated power for a third CC with alength TTI 220 in the second PUCCH group. Similarly, the total reservedpower for sTTIs 230-a may be defined as:P _(a) +P _(b) +P _(c) +P _(d) =P _(2os)  (3)where P_(a) corresponds to an allocated power for a first CC with alength sTTI 230-a in the first PUCCH group, P_(b) corresponds to anallocated power for a second CC with a length sTTI 230-a in the firstPUCCH group, P_(c) corresponds to an allocated power for a third CC witha length sTTI 230-a in the first PUCCH group, and P_(d) corresponds toan allocated power for a fourth CC with a length sTTI 230-a in the firstPUCCH group. Similarly, the total reserved power for sTTIs 230-b may bedefined as:P _(a) +P _(b) +P _(c) =P _(7os)  (4)where P_(a) corresponds to an allocated power for a first CC with alength sTTI 230-b in the second PUCCH group, P_(b) corresponds to anallocated power for a second CC with a length sTTI 230-b in the secondPUCCH group, and P_(c) corresponds to an allocated power for a third CCwith a length sTTI 230-b in the second PUCCH group. The total power ofeach CC (i.e., P_(a), P_(b), P_(c), or P_(d)) may not exceed thereserved power for its respective TTI length (e.g., P_(1msec) for TTI220, P_(2os) for sTTI 230-a, P_(7os) for sTTI 230-b, etc.).

In some examples, Δ may be 0 or another number chosen by base station105-a. Δ may include an amount of extra power that can be utilized forone of the different TTI lengths if a total power for a group of TTIsexceeds the allocated power. The extra power may be utilized on apriority basis. In some cases, sTTIs 230-a may utilize the extra powersince it is scheduled last for power control by base station 105-a(e.g., prioritize allocation of extra power to a TTI and/or sTTI basedon scheduling). Alternatively, the extra power may be utilized by a TTIlength group (e.g., TTIs 220, sTTIs 230-a, or sTTIs 230-b) that exceedsits reserved power limit first.

UE 115-a may allocate the reserved power for each TTI length to the CCsthat have that TTI length based on a set of priority rules for theuplink data in each CC. For example, CCs that contain PUCCH messages maytake priority to CCs that contain PUSCH messages with UCI. Additionally,CCs that contain PUSCH messages with UCI may take priority to CCs thatcontain PUSCH messages without UCI, and PUSCH messages without UCI maytake priority to CCs that contain reference signals (e.g., SRS). In somecases, UCI may include HARQ acknowledgement (HARQ-ACK) messaging forpreviously received downlink messages. UE 115-a may allocate more of thetotal reserved power to CCs that have higher priority uplink data andmay scale down the amount of power allocated for the other CCs. If twoor more CCs in a given TTI length transmit the same priority uplinkdata, then UE 115-a may scale each CC down equally. For example, if twoCCs within a given TTI length transmit PUSCH with UCI, then UE 115-a mayscale both CCs down proportionally.

In some cases, base station 105-a may transmit the power reservationinformation semi-statically through RRC over downlink communicationslink 210. Alternatively, base station 105-a may transmit the powerreservation information in a more dynamic manner via power controlindications over downlink communications link 210. Additionally, UE115-a may utilize a set of dropping rules in case of conflicting TTIsscheduled to be transmitted at the same time. In some cases, basestation 105-a may determine the dropping rules in case of conflict andmay transmit the rules to UE 115-a over downlink communications link210. In some cases, UE 115-a may determine and utilize the droppingrules based on the different TTI durations and/or PUCCH groups.

FIGS. 3A and 3B illustrate examples of a dropping scheme 301 and 302 ina system that supports power reservation and dropping rules for TTIs inaccordance with various aspects of the present disclosure. In someexamples, dropping scheme 301 and 302 may implement aspects of wirelesscommunications systems 100 and 200. Dropping scheme 301 and 302 mayillustrate techniques by which a UE 115 may prioritize different TTIlengths in case of a conflict when TTIs of different lengths arescheduled for transmission at a same time. A base station 105 maytransmit an indication of dropping scheme 301 and 302 to the UE 115, forexample, within power reservation information sent to the UE 115. Insome cases, the UE 115 may determine and utilize dropping schemes 301and/or 302 based on different configured TTI durations and/or PUCCHgroups.

As shown in FIG. 3A, the UE 115 may be scheduled to transmit a TTI 320and an sTTI 330-a at the same time. TTI 320 may correspond to a TTI 220as described with reference to FIG. 2 (e.g., including multiple slots,or seven symbol sTTIs) comprising a subframe or a 1 ms TTI, and sTTIs330-a may correspond to an sTTI 230-a as described with reference toFIG. 2 (e.g., a two-symbol or three-symbol TTI). In some examples, thebase station 105 may indicate to the UE 115 to prioritize TTIs having arelatively shorter duration in a set of dropping rules (i.e.,corresponding to dropping scheme 301) or the UE 115 independently maydetermine the set of dropping rules to apply. In accordance withdropping scheme 301, a portion of TTI 320 and sTTI 330-a may bescheduled for transmission at the same time. Upon identifying thecollision, the UE 115 may prioritize sTTI 330-a and allocate power totransmit sTTI 330-a (e.g., based on TTI length), while dropping aremainder of the symbols in TTI 320 for a time 340-a. In other example,priority may be given to TTIs having longer durations, or the priorityrules may be based on a content of the TTI, as described above.

As shown in FIG. 3B, different sTTIs may collide with each other atdifferent times. For example, dropping scheme 302 may illustratemultiple sTTIs 325-a and 325-b that are scheduled to be transmitted atthe same time as sTTI 330-b. In such cases, sTTIs 325-a and 325-b maycorrespond to the seven symbol sTTIs 230-b described with reference toFIG. 2. Upon identifying the collision, the UE 115 may prioritize sTTI330-b, while dropping the remaining OFDM symbols of sTTI 325-a for atime 340-b, which may be based on a duration of sTTI 330-b. As with thedropping rules described above, the UE 115 may prioritize and allocatemore power to the shorter sTTI (e.g., two symbol sTTI 330-b) and dropthe longer sTTI (e.g., seven symbol sTTI 325-a). Additionally, if TTIsof a same length collide, the UE 115 may assign priority and more powerallocation to one of the TTIs and drop the rest (e.g., drop a whole TTIor a remaining number of symbol periods). The dropping rules may beapplied to inter-band, intra-band contiguous, intra-band non-contiguousCA cases, and the like.

FIG. 4 illustrates an example of a process flow 400 that supports powerreservation and dropping rules for transmission time intervals inaccordance with various aspects of the present disclosure. In someexamples, process flow 400 may implement aspects of wirelesscommunications systems 100 and 200. Process flow 400 illustrates aspectsof techniques performed by a base station 105-b and a UE 115-b, whichmay be examples of a base station 105 and a UE 115 as described withreference to FIGS. 1-3.

In the following description of the process flow 400, the operationsbetween the UE 115-b and base station 105-b may be performed indifferent orders or at different times. Certain operations may also beleft out of the process flow 400, or other operations may be added tothe process flow 400.

At 405, base station 105-b may identify TTIs of a set of CCs of a CAmode. Base station 105-b may then categorize, by TTI duration (i.e., TTIlength), the TTIs of the set of CCs into respective groups of TTIs.Additionally or alternatively, base station 105-b may identify a set ofCCs of a CA mode, respective CCs of the set of CCs being associated witha first PUCCH group or a second PUCCH group.

At 410, base station 105-b may determine a reserved power for eachrespective group of TTIs of the CCs based on the TTI duration.Additionally, base station 105-b may determine an additional reservedpower to use by UE 115-b when calculating a maximum transmit powerlimit, where a sum of the sum of the reserved powers and the additionalreserved power is less than or equal to the maximum transmit powerlimit. Additionally or alternatively, base station 105-b may determine areserved power for each of the first PUCCH group and the second PUCCHgroup.

At 415, base station 105-b may transmit, to UE 115-b, power reservationinformation that indicates the reserved power for each respective groupof TTIs. Additionally or alternatively, the power reservationinformation may indicate the reserved power for each of the first PUCCHgroup and the second PUCCH group. Base station 105-b may transmit thepower reservation information to UE 115-b via semi-static signaling orvia a transmit power control command. The semi-static signaling mayinclude RRC messaging. Additionally, UE 115-b may identify a reservedpower for each respective group of TTIs of the set of CCs based on thereceived power reservation information. At 420, UE 115-b may categorize,by TTI duration (i.e., TTI length or number of symbol periods of theTTI), the TTIs of the set of CCs into respective groups of TTIs.

At 425, UE 115-b may determine the maximum transmit power limit based ona sum of the reserved powers. Additionally or alternatively, UE 115-bmay determine the maximum transmit power limit based on a sum of thereserved powers for each respective group (i.e., a first PUCCH group anda second PUCCH group) of TTIs. In some cases, determining the maximumtransmit power may include determining a total transmit power based onthe sum of the reserved powers and identifying an additional reservedpower indicated by the power reservation information, where a sum of thetotal transmit power and the additional reserved power is less than orequal to the maximum transmit power limit. In some cases, UE 115-b mayallocate the additional reserved power to a first TTI group of therespective groups of TTIs based on a TTI priority, where a total powerof the first TTI group is greater than a reserved power of the first TTIgroup. The TTIs of the first TTI group may have a first TTI durationthat is shorter than a second TTI duration of another TTI. Additionallyor alternatively, UE 115-b may allocate the additional reserved power toa first TTI group of the respective groups of TTIs, a reserved power ofthe first TTI group being exceeded before other respective groups ofTTIs exceed respective reserved powers, where a total power of the firstTTI group is greater than the reserved power of the first TTI group.

At 430, UE 115-b may determine a content to be transmitted on each CC ofthe set of CCs and during each respective group of TTIs. UE 115-b mayfurther scale a transmit power for each respective group of TTIs basedon a priority of the content. Additionally, UE 115-b may identify two ofmore CCs of the set of CCs that transmit a same content using a same TTIduration and may scale the transmit power for the two or more CCs basedon a priority of the content. The content may include a PUCCH, or PUSCHincluding UCI, or a PUSCH that does not include UCI, or a SRS (e.g.,reference signal).

At 435, UE 115-b may identify a collision between a first TTI having afirst duration and a second TTI having a second duration to betransmitted on the set of CCs, the second duration being less than thefirst duration. UE 115-b may determine a priority of the first TTI andthe second TTI. Additionally, UE 115-b may drop one or more symbolperiods of the first TTI or the second TTI having a lowest prioritybased on the determined priority and may allocate a reserved power tothe first TTI or the second TTI having a highest priority based on thedetermined priority. At 440, UE 115-b may transmit uplink signals duringthe TTIs of the set of CCs using a transmit power that is less than thedetermined maximum transmit power limit. For example, the uplink signalsmay include uplink control or data, or reference signals such as an SRS.

FIG. 5 shows a block diagram 500 of a wireless device 505 that supportspower reservation and dropping rules for TTIs in accordance with aspectsof the present disclosure. Wireless device 505 may be an example ofaspects of a UE 115 as described herein. Wireless device 505 may includereceiver 510, UE communications manager 515, and transmitter 520.Wireless device 505 may also include a processor. Each of thesecomponents may be in communication with one another (e.g., via one ormore buses).

Receiver 510 may receive information such as packets, user data, orcontrol information associated with various information channels (e.g.,control channels, data channels, and information related to powerreservation and dropping rules for TTIs, etc.). Information may bepassed on to other components of the device. The receiver 510 may be anexample of aspects of the transceiver 835 described with reference toFIG. 8. The receiver 510 may utilize a single antenna or a set ofantennas.

UE communications manager 515 may be an example of aspects of the UEcommunications manager 815 described with reference to FIG. 8. UEcommunications manager 515 and/or at least some of its varioussub-components may be implemented in hardware, software executed by aprocessor, firmware, or any combination thereof. If implemented insoftware executed by a processor, the functions of the UE communicationsmanager 515 and/or at least some of its various sub-components may beexecuted by a general-purpose processor, a digital signal processor(DSP), an application-specific integrated circuit (ASIC), anfield-programmable gate array (FPGA) or other programmable logic device,discrete gate or transistor logic, discrete hardware components, or anycombination thereof designed to perform the functions described in thepresent disclosure.

The UE communications manager 515 and/or at least some of its varioussub-components may be physically located at various positions, includingbeing distributed such that portions of functions are implemented atdifferent physical locations by one or more physical devices. In someexamples, UE communications manager 515 and/or at least some of itsvarious sub-components may be a separate and distinct component inaccordance with various aspects of the present disclosure. In otherexamples, UE communications manager 515 and/or at least some of itsvarious sub-components may be combined with one or more other hardwarecomponents, including but not limited to an I/O component, atransceiver, a network server, another computing device, one or moreother components described in the present disclosure, or a combinationthereof in accordance with various aspects of the present disclosure.

UE communications manager 515 may receive, from a base station, powerreservation information for TTIs to be used with a set of CCs of a CAmode, and may categorize, by TTI duration, the TTIs of the set of CCsinto respective groups of TTIs. In some examples, UE communicationsmanager 515 may identify a reserved power for each respective group ofTTIs of the set of CCs based on the received power reservationinformation and determine a maximum transmit power limit based on a sumof the reserved powers. UE communications manager 515 may transmitduring the TTIs of the set of CCs using a transmit power that is lessthan the determined maximum transmit power limit.

Additionally or alternatively, UE communications manager 515 mayreceive, from a base station, power reservation information for a set ofCCs of a CA mode, respective CCs of the set of CCs associated with afirst PUCCH group or a second PUCCH group. UE communications manager 515may identify a reserved power for each of the first PUCCH group and thesecond PUCCH group based on the received power reservation information,determine a maximum transmit power limit based on a sum of the reservedpowers, and transmit on the set of CCs using a transmit power that isless than or equal to the determined maximum transmit power limit.

Transmitter 520 may transmit signals generated by other components ofthe device. In some examples, the transmitter 520 may be collocated witha receiver 510 in a transceiver module. For example, the transmitter 520may be an example of aspects of the transceiver 835 described withreference to FIG. 8. The transmitter 520 may utilize a single antenna ora set of antennas.

FIG. 6 shows a block diagram 600 of a wireless device 605 that supportspower reservation and dropping rules for TTIs in accordance with aspectsof the present disclosure. Wireless device 605 may be an example ofaspects of a wireless device 505 or a UE 115 as described with referenceto FIG. 5. Wireless device 605 may include receiver 610, UEcommunications manager 615, and transmitter 620. Wireless device 605 mayalso include a processor. Each of these components may be incommunication with one another (e.g., via one or more buses).

Receiver 610 may receive information such as packets, user data, orcontrol information associated with various information channels (e.g.,control channels, data channels, and information related to powerreservation and dropping rules for TTIs, etc.). Information may bepassed on to other components of the device. The receiver 610 may be anexample of aspects of the transceiver 835 described with reference toFIG. 8. The receiver 610 may utilize a single antenna or a set ofantennas.

UE communications manager 615 may be an example of aspects of the UEcommunications manager 815 described with reference to FIG. 8. UEcommunications manager 615 may also include transmission power manager625, UE TTI manager 630, UE reserved power manager 635, uplinktransmission component 640, and PUCCH group manager 645.

Transmission power manager 625 may receive, from a base station 105,power reservation information for TTIs to be used with a set of CCs of aCA mode and determine a maximum transmit power limit based on a sum ofthe reserved powers. Additionally or alternatively, transmission powermanager 625 may receive, from the base station 105, power reservationinformation for a set of CCs of a CA mode, respective CCs of the set ofCCs associated with a first PUCCH group or a second PUCCH group. In someexamples, transmission power manager 625 may determine a maximumtransmit power limit based on a sum of the reserved powers for eachrespective group of TTIs. In some aspects, transmission power manager625 may receive the power reservation information via semi-staticsignaling from the base station or via a transmit power control commandfrom the base station.

In some examples, transmission power manager 625 may scale a transmitpower for CCs or for TTIs, or both, based on various factors. Forinstance, transmission power manager 625 may scale the transmit powerfor the two or more CCs based on a priority of the content, or may scalea transmit power of the first PUCCH group or the second PUCCH groupbased on a priority of the content and a TTI duration. In otherexamples, transmission power manager 625 may scale a transmit power foreach respective group of TTIs based on a priority of the content. Insome cases, the semi-static signaling includes RRC messaging. In somecases, determining the maximum transmit power limit includes:determining a total transmit power based on the sum of the reservedpowers.

UE TTI manager 630 may categorize, by TTI duration, the TTIs of the setof CCs into respective groups of TTIs. In some examples, UE TTI manager630 may identify a collision between a first TTI having a first durationand a second TTI having a second duration to be transmitted on the setof CCs, the second duration being less than the first duration. UEreserved power manager 635 may identify a reserved power for eachrespective group of TTIs of the set of CCs based on the received powerreservation information. In some examples, UE reserved power manager 635may receive, within the power reservation information, an indication ofreserved powers for respective groups of TTIs to be used with the firstPUCCH group and the second PUCCH group.

Uplink transmission component 640 may transmit during the TTIs of theset of CCs using a transmit power that is less than the determinedmaximum transmit power limit and transmit on the set of CCs using atransmit power that is less than or equal to the determined maximumtransmit power limit. PUCCH group manager 645 may identify a reservedpower for each of the first PUCCH group and the second PUCCH group basedon the received power reservation information.

Transmitter 620 may transmit signals generated by other components ofthe device. In some examples, the transmitter 620 may be collocated witha receiver 610 in a transceiver module. For example, the transmitter 620may be an example of aspects of the transceiver 835 described withreference to FIG. 8. The transmitter 620 may utilize a single antenna ora set of antennas.

FIG. 7 shows a block diagram 700 of a UE communications manager 715 thatsupports power reservation and dropping rules for TTIs in accordancewith aspects of the present disclosure. The UE communications manager715 may be an example of aspects of a UE communications manager 515, aUE communications manager 615, or a UE communications manager 815described with reference to FIGS. 5, 6, and 8. The UE communicationsmanager 715 may include transmission power manager 720, UE TTI manager725, UE reserved power manager 730, uplink transmission component 735,PUCCH group manager 740, reserved power manager 745, power allocationmanager 750, content manager 755, and TTI priority component 760. Eachof these modules may communicate, directly or indirectly, with oneanother (e.g., via one or more buses).

Transmission power manager 720 may receive, from a base station 105,power reservation information for TTIs to be used with a set of CCs of aCA mode and determine a maximum transmit power limit based on a sum ofthe reserved powers. Additionally or alternatively, transmission powermanager 720 may receive, from the base station 105, power reservationinformation for a set of CCs of a CA mode, respective CCs of the set ofCCs associated with a first PUCCH group or a second PUCCH group. In someexamples, transmission power manager 720 may determine a maximumtransmit power limit based on a sum of the reserved powers for eachrespective group of TTIs. In some aspects, transmission power manager720 may receive the power reservation information via semi-staticsignaling from the base station or via a transmit power control commandfrom the base station.

In some examples, transmission power manager 720 may scale a transmitpower for CCs or for TTIs, or both, based on various factors. Forinstance, transmission power manager 720 may scale the transmit powerfor the two or more CCs based on a priority of the content, or may scalea transmit power of the first PUCCH group or the second PUCCH groupbased on a priority of the content and a TTI duration. In otherexamples, transmission power manager 720 may scale a transmit power foreach respective group of TTIs based on a priority of the content. Insome cases, the semi-static signaling includes RRC messaging. In somecases, determining the maximum transmit power limit includes:determining a total transmit power based on the sum of the reservedpowers.

UE TTI manager 725 may categorize, by TTI duration, the TTIs of the setof CCs into respective groups of TTIs. In some examples, UE TTI manager725 may identify a collision between a first TTI having a first durationand a second TTI having a second duration to be transmitted on the setof CCs, the second duration being less than the first duration. UEreserved power manager 730 may identify a reserved power for eachrespective group of TTIs of the set of CCs based on the received powerreservation information and receive, within the power reservationinformation, an indication of reserved powers for respective groups ofTTIs to be used with the first PUCCH group and the second PUCCH group.

Uplink transmission component 735 may transmit during the TTIs of theset of CCs using a transmit power that is less than the determinedmaximum transmit power limit and transmit on the set of CCs using atransmit power that is less than or equal to the determined maximumtransmit power limit. PUCCH group manager 740 may identify a reservedpower for each of the first PUCCH group and the second PUCCH group basedon the received power reservation information.

Reserved power manager 745 may identify an additional reserved powerindicated by the power reservation information, where a sum of the totaltransmit power and the additional reserved power is less than or equalto the maximum transmit power limit. Power allocation manager 750 may,in some cases, allocate the additional reserved power to a first TTIgroup of the respective groups of TTIs based on a TTI priority, where atotal power of the first TTI group is greater than a reserved power ofthe first TTI group. Additionally or alternatively, power allocationmanager 750 may allocate the additional reserved power to a first TTIgroup of the respective groups of TTIs, a reserved power of the firstTTI group being exceeded before other respective groups of TTIs exceedother respective reserved powers, where a total power of the first TTIgroup is greater than the reserved power of the first TTI group. In someexamples, power allocation manager 750 may allocate a reserved power tothe first TTI or the second TTI having a highest priority based on thedetermined priority. In some cases, the TTIs of the first TTI group havea first TTI duration that is shorter than a second TTI duration ofanother TTI.

Content manager 755 may determine a content to be transmitted on each CCof the set of CCs and during each respective group of TTIs. In someexamples, content manager 755 may identify two of more CCs of the set ofCCs that transmit a same content using a same TTI duration, anddetermine a content to be transmitted for the first PUCCH group and thesecond PUCCH group and during each respective group of TTIs. In somecases, the content includes a PUCCH, or a PUSCH including UCI, or aPUSCH that does not include UCI, or an SRS. TTI priority component 760may determine a priority of the first TTI and the second TTI and dropone or more symbol periods of the first TTI or the second TTI having alowest priority based on the determined priority.

In some cases, TTI priority component 760 may drop a transmission basedon content or length of a first TTI of the TTIs. Accordingly, in someexamples, dropping the transmission is based on the length of the firstTTI, and where the length of the first TTI is a subframe or a slot.Additionally or alternatively, TTI priority component 760 may drop atleast a portion of a first TTI of the TTIs based on at least onedropping rule. In some examples, TTI priority component 760 may drop atleast a portion of a first TTI of the TTIs based on a duration of thefirst TTI.

Additionally, in some cases, content manager 755 may drop thetransmission based on the content of the first TTI, and where thecontent of the first TTI includes a PUCCH, or a PUSCH with UCI, or aPUSCH without UCI, or a reference signal. In some examples, contentmanager 755 may drop at least a portion of a first TTI of the TTIs basedon a priority of content scheduled to be transmitted in the first TTI.Additionally or alternatively, content manager 755 may determine firstcontent of a first control channel group scheduled to be transmittedduring a first TTI of the TTIs and second content of a second controlchannel group scheduled to be transmitted during a second TTI of theTTIs. In some cases, the content manager 755 may drop at least a portionof the first TTI or the second TTI based on a priority of the firstcontent and a priority of the second content. In some examples, droppingat least a portion of a first TTI of the TTIs may be based on whethercontent scheduled to be transmitted in the first TTI includes uplinkcontrol information. Additionally or alternatively, the content manager755 may drop at least a portion of a first TTI of the TTIs based onwhether a signal scheduled to be transmitted within the first TTI is areference signal.

Power allocation manager 750 may allocate the transmit power based onthe dropping the transmission or at least a portion of a first TTI asdescribed above.

FIG. 8 shows a diagram of a system 800 including a device 805 thatsupports power reservation and dropping rules for TTIs in accordancewith aspects of the present disclosure. Device 805 may be an example ofor include the components of wireless device 505, wireless device 605,or a UE 115 as described above, e.g., with reference to FIGS. 5 and 6.Device 805 may include components for bi-directional voice and datacommunications including components for transmitting and receivingcommunications, including UE communications manager 815, processor 820,memory 825, software 830, transceiver 835, antenna 840, and I/Ocontroller 845. These components may be in electronic communication viaone or more buses (e.g., bus 810). Device 805 may communicate wirelesslywith one or more base stations 105.

Processor 820 may include an intelligent hardware device, (e.g., ageneral-purpose processor, a DSP, a central processing unit (CPU), amicrocontroller, an ASIC, an FPGA, a programmable logic device, adiscrete gate or transistor logic component, a discrete hardwarecomponent, or any combination thereof). In some cases, processor 820 maybe configured to operate a memory array using a memory controller. Inother cases, a memory controller may be integrated into processor 820.Processor 820 may be configured to execute computer-readableinstructions stored in a memory to perform various functions (e.g.,functions or tasks supporting power reservation and dropping rules forTTIs).

Memory 825 may include random access memory (RAM) and read only memory(ROM). The memory 825 may store computer-readable, computer-executablesoftware 830 including instructions that, when executed, cause theprocessor to perform various functions described herein. In some cases,the memory 825 may contain, among other things, a basic input/outputsystem (BIOS) which may control basic hardware or software operationsuch as the interaction with peripheral components or devices.

Software 830 may include code to implement aspects of the presentdisclosure, including code to support power reservation and droppingrules for TTIs. Software 830 may be stored in a non-transitorycomputer-readable medium such as system memory or other memory. In somecases, the software 830 may not be directly executable by the processorbut may cause a computer (e.g., when compiled and executed) to performfunctions described herein.

Transceiver 835 may communicate bi-directionally, via one or moreantennas, wired, or wireless links as described above. For example, thetransceiver 835 may represent a wireless transceiver and may communicatebi-directionally with another wireless transceiver. The transceiver 835may also include a modem to modulate the packets and provide themodulated packets to the antennas for transmission, and to demodulatepackets received from the antennas.

In some cases, the wireless device may include a single antenna 840.However, in some cases the device may have more than one antenna 840,which may be capable of concurrently transmitting or receiving multiplewireless transmissions.

I/O controller 845 may manage input and output signals for device 805.I/O controller 845 may also manage peripherals not integrated intodevice 805. In some cases, I/O controller 845 may represent a physicalconnection or port to an external peripheral. In some cases, I/Ocontroller 845 may utilize an operating system such as iOS®, ANDROID®,MS-DOS®, MS-WINDOWS®, OS/2®, UNIX®, LINUX®, or another known operatingsystem. In other cases, I/O controller 845 may represent or interactwith a modem, a keyboard, a mouse, a touchscreen, or a similar device.In some cases, I/O controller 845 may be implemented as part of aprocessor. In some cases, a user may interact with device 805 via I/Ocontroller 845 or via hardware components controlled by I/O controller845.

FIG. 9 shows a block diagram 900 of a wireless device 905 that supportspower reservation and dropping rules for TTIs in accordance with aspectsof the present disclosure. Wireless device 905 may be an example ofaspects of a base station 105 as described herein. Wireless device 905may include receiver 910, base station communications manager 915, andtransmitter 920. Wireless device 905 may also include a processor. Eachof these components may be in communication with one another (e.g., viaone or more buses).

Receiver 910 may receive information such as packets, user data, orcontrol information associated with various information channels (e.g.,control channels, data channels, and information related to powerreservation and dropping rules for TTIs, etc.). Information may bepassed on to other components of the device. The receiver 910 may be anexample of aspects of the transceiver 1235 described with reference toFIG. 12. The receiver 910 may utilize a single antenna or a set ofantennas.

Base station communications manager 915 may be an example of aspects ofthe base station communications manager 1215 described with reference toFIG. 12. Base station communications manager 915 and/or at least some ofits various sub-components may be implemented in hardware, softwareexecuted by a processor, firmware, or any combination thereof. Ifimplemented in software executed by a processor, the functions of thebase station communications manager 915 and/or at least some of itsvarious sub-components may be executed by a general-purpose processor, aDSP, an ASIC, an FPGA or other programmable logic device, discrete gateor transistor logic, discrete hardware components, or any combinationthereof designed to perform the functions described in the presentdisclosure.

The base station communications manager 915 and/or at least some of itsvarious sub-components may be physically located at various positions,including being distributed such that portions of functions areimplemented at different physical locations by one or more physicaldevices. In some examples, base station communications manager 915and/or at least some of its various sub-components may be a separate anddistinct component in accordance with various aspects of the presentdisclosure. In other examples, base station communications manager 915and/or at least some of its various sub-components may be combined withone or more other hardware components, including but not limited to anI/O component, a transceiver, a network server, another computingdevice, one or more other components described in the presentdisclosure, or a combination thereof in accordance with various aspectsof the present disclosure.

Base station communications manager 915 may identify TTIs of a set ofCCs of a CA mode, categorize, by TTI duration, the TTIs of the set ofCCs into respective groups of TTIs, determine a reserved power for eachrespective group of TTIs of the set of CCs based on the TTI duration,and transmit, to a UE, power reservation information that indicates thereserved power for each respective group of TTIs.

Additionally or alternatively, base station communications manager 915may identify a set of CCs of a CA mode, respective CCs of the set of CCsbeing associated with a first PUCCH group or a second PUCCH group. Insuch cases, base station communications manager 915 may determine areserved power for each of the first PUCCH group and the second PUCCHgroup, and transmit, to a UE 115, power reservation information thatindicates the reserved power for each of the first PUCCH group and thesecond PUCCH group.

Transmitter 920 may transmit signals generated by other components ofthe device. In some examples, the transmitter 920 may be collocated witha receiver 910 in a transceiver module. For example, the transmitter 920may be an example of aspects of the transceiver 1235 described withreference to FIG. 12. The transmitter 920 may utilize a single antennaor a set of antennas.

FIG. 10 shows a block diagram 1000 of a wireless device 1005 thatsupports power reservation and dropping rules for TTIs in accordancewith aspects of the present disclosure. Wireless device 1005 may be anexample of aspects of a wireless device 905 or a base station 105 asdescribed with reference to FIG. 9. Wireless device 1005 may includereceiver 1010, base station communications manager 1015, and transmitter1020. Wireless device 1005 may also include a processor. Each of thesecomponents may be in communication with one another (e.g., via one ormore buses).

Receiver 1010 may receive information such as packets, user data, orcontrol information associated with various information channels (e.g.,control channels, data channels, and information related to powerreservation and dropping rules for TTIs, etc.). Information may bepassed on to other components of the device. The receiver 1010 may be anexample of aspects of the transceiver 1235 described with reference toFIG. 12. The receiver 1010 may utilize a single antenna or a set ofantennas.

Base station communications manager 1015 may be an example of aspects ofthe base station communications manager 1215 described with reference toFIG. 12. Base station communications manager 1015 may also include basestation TTI manager 1025, base station reserved power manager 1030,power reservation component 1035, and CC manager 1040.

Base station TTI manager 1025 may identify TTIs of a set of CCs of a CAmode and categorize, by TTI duration, the TTIs of the set of CCs intorespective groups of TTIs. Base station reserved power manager 1030 maydetermine a reserved power for each respective group of TTIs of the setof CCs based on the TTI duration. In some examples, base stationreserved power manager 1030 may determine an additional reserved powerto use by a UE 115 when calculating a maximum transmit power limit,where a sum of the reserved powers and the additional reserved power isless than or equal to the maximum transmit power limit. In some cases,base station reserved power manager 1030 may determine a reserved powerfor each of a first PUCCH group and a second PUCCH group.

Power reservation component 1035 may transmit, to the UE 115, powerreservation information that indicates the reserved power for eachrespective group of TTIs. Power reservation component 1035 may alsotransmit the power reservation information to the UE 115 via semi-staticsignaling or via a transmit power control command. In some cases, powerreservation component 1035 may transmit an indication of the additionalreserved power in the power reservation information, and transmit, tothe UE 115, power reservation information that indicates the reservedpower for each of the first PUCCH group and the second PUCCH group. Insome cases, the semi-static signaling includes RRC messaging. CC manager1040 may identify a set of CCs of a CA mode, respective CCs of the setof CCs being associated with a first PUCCH group or a second PUCCHgroup.

Transmitter 1020 may transmit signals generated by other components ofthe device. In some examples, the transmitter 1020 may be collocatedwith a receiver 1010 in a transceiver module. For example, thetransmitter 1020 may be an example of aspects of the transceiver 1235described with reference to FIG. 12. The transmitter 1020 may utilize asingle antenna or a set of antennas.

FIG. 11 shows a block diagram 1100 of a base station communicationsmanager 1115 that supports power reservation and dropping rules for TTIsin accordance with aspects of the present disclosure. The base stationcommunications manager 1115 may be an example of aspects of a basestation communications manager 1215 described with reference to FIGS. 9,10, and 12. The base station communications manager 1115 may includebase station TTI manager 1120, base station reserved power manager 1125,power reservation component 1130, and CC manager 1135. Each of thesemodules may communicate, directly or indirectly, with one another (e.g.,via one or more buses).

Base station TTI manager 1120 may identify TTIs of a set of CCs of a CAmode and categorize, by TTI duration, the TTIs of the set of CCs intorespective groups of TTIs. Base station reserved power manager 1125 maydetermine a reserved power for each respective group of TTIs of the setof CCs based on the TTI duration. In some examples, base stationreserved power manager 1125 may determine an additional reserved powerto use by a UE 115 when calculating a maximum transmit power limit,where a sum of the reserved powers and the additional reserved power isless than or equal to the maximum transmit power limit. In some cases,base station reserved power manager 1125 may determine a reserved powerfor each of a first PUCCH group and a second PUCCH group.

Power reservation component 1130 may transmit, to the UE 115, powerreservation information that indicates the reserved power for eachrespective group of TTIs. Power reservation component 1130 may alsotransmit the power reservation information to the UE 115 via semi-staticsignaling or via a transmit power control command. In some cases, powerreservation component 1130 may transmit an indication of the additionalreserved power in the power reservation information, and transmit, tothe UE 115, power reservation information that indicates the reservedpower for each of the first PUCCH group and the second PUCCH group. Insome cases, the semi-static signaling includes RRC messaging. CC manager1135 may identify a set of CCs of a CA mode, respective CCs of the setof CCs being associated with a first PUCCH group or a second PUCCHgroup.

FIG. 12 shows a diagram of a system 1200 including a device 1205 thatsupports power reservation and dropping rules for TTIs in accordancewith aspects of the present disclosure. Device 1205 may be an example ofor include the components of base station 105 as described above, e.g.,with reference to FIG. 1. Device 1205 may include components forbi-directional voice and data communications including components fortransmitting and receiving communications, including base stationcommunications manager 1215, processor 1220, memory 1225, software 1230,transceiver 1235, antenna 1240, network communications manager 1245, andinter-station communications manager 1250. These components may be inelectronic communication via one or more buses (e.g., bus 1210). Device1205 may communicate wirelessly with one or more UEs 115.

Processor 1220 may include an intelligent hardware device, (e.g., ageneral-purpose processor, a DSP, a CPU, a microcontroller, an ASIC, anFPGA, a programmable logic device, a discrete gate or transistor logiccomponent, a discrete hardware component, or any combination thereof).In some cases, processor 1220 may be configured to operate a memoryarray using a memory controller. In other cases, a memory controller maybe integrated into processor 1220. Processor 1220 may be configured toexecute computer-readable instructions stored in a memory to performvarious functions (e.g., functions or tasks supporting power reservationand dropping rules for TTIs).

Memory 1225 may include RAM and ROM. The memory 1225 may storecomputer-readable, computer-executable software 1230 includinginstructions that, when executed, cause the processor to perform variousfunctions described herein. In some cases, the memory 1225 may contain,among other things, a BIOS which may control basic hardware or softwareoperation such as the interaction with peripheral components or devices.

Software 1230 may include code to implement aspects of the presentdisclosure, including code to support power reservation and droppingrules for TTIs. Software 1230 may be stored in a non-transitorycomputer-readable medium such as system memory or other memory. In somecases, the software 1230 may not be directly executable by the processorbut may cause a computer (e.g., when compiled and executed) to performfunctions described herein.

Transceiver 1235 may communicate bi-directionally, via one or moreantennas, wired, or wireless links as described above. For example, thetransceiver 1235 may represent a wireless transceiver and maycommunicate bi-directionally with another wireless transceiver. Thetransceiver 1235 may also include a modem to modulate the packets andprovide the modulated packets to the antennas for transmission, and todemodulate packets received from the antennas.

In some cases, the wireless device may include a single antenna 1240.However, in some cases the device may have more than one antenna 1240,which may be capable of concurrently transmitting or receiving multiplewireless transmissions. Network communications manager 1245 may managecommunications with the core network (e.g., via one or more wiredbackhaul links). For example, the network communications manager 1245may manage the transfer of data communications for client devices, suchas one or more UEs 115.

Inter-station communications manager 1250 may manage communications withother base station 105, and may include a controller or scheduler forcontrolling communications with UEs 115 in cooperation with other basestations 105. For example, the inter-station communications manager 1250may coordinate scheduling for transmissions to UEs 115 for variousinterference mitigation techniques such as beamforming or jointtransmission. In some examples, inter-station communications manager1250 may provide an X2 interface within an LTE/LTE-A wirelesscommunication network technology to provide communication between basestations 105.

FIG. 13 shows a flowchart illustrating a method 1300 for powerreservation and dropping rules for TTIs in accordance with aspects ofthe present disclosure. The operations of method 1300 may be implementedby a UE 115 or its components as described herein. For example, theoperations of method 1300 may be performed by a UE communicationsmanager as described with reference to FIGS. 5 through 8. In someexamples, a UE 115 may execute a set of codes to control the functionalelements of the device to perform the functions described below.Additionally or alternatively, the UE 115 may perform aspects of thefunctions described below using special-purpose hardware.

At 1305 the UE 115 may receive, from a base station 105, powerreservation information for TTIs to be used with a set of CCs of a CAmode. The operations of 1305 may be performed according to the methodsdescribed herein. In certain examples, aspects of the operations of 1305may be performed by a transmission power manager as described withreference to FIGS. 5 through 8.

At 1310 the UE 115 may categorize, by TTI duration, the TTIs of the setof CCs into respective groups of TTIs. The operations of 1310 may beperformed according to the methods described herein. In certainexamples, aspects of the operations of 1310 may be performed by a UE TTImanager as described with reference to FIGS. 5 through 8.

At 1315 the UE 115 may identify a reserved power for each respectivegroup of TTIs of the set of CCs based on the received power reservationinformation. The operations of 1315 may be performed according to themethods described herein. In certain examples, aspects of the operationsof 1315 may be performed by a UE reserved power manager as describedwith reference to FIGS. 5 through 8.

At 1320 the UE 115 may determine a maximum transmit power limit based ona sum of the reserved powers. The operations of 1320 may be performedaccording to the methods described herein. In certain examples, aspectsof the operations of 1320 may be performed by a transmission powermanager as described with reference to FIGS. 5 through 8.

At 1325 the UE 115 may transmit during the TTIs of the set of CCs usinga transmit power that is less than the determined maximum transmit powerlimit. The operations of 1325 may be performed according to the methodsdescribed herein. In certain examples, aspects of the operations of 1325may be performed by a uplink transmission component as described withreference to FIGS. 5 through 8.

FIG. 14 shows a flowchart illustrating a method 1400 for powerreservation and dropping rules for TTIs in accordance with aspects ofthe present disclosure. The operations of method 1400 may be implementedby a UE 115 or its components as described herein. For example, theoperations of method 1400 may be performed by a UE communicationsmanager as described with reference to FIGS. 5 through 8. In someexamples, a UE 115 may execute a set of codes to control the functionalelements of the device to perform the functions described below.Additionally or alternatively, the UE 115 may perform aspects of thefunctions described below using special-purpose hardware.

At 1405 the UE 115 may receive, from a base station 105, powerreservation information for TTIs to be used with a set of CCs of a CAmode. The operations of 1405 may be performed according to the methodsdescribed herein. In certain examples, aspects of the operations of 1405may be performed by a transmission power manager as described withreference to FIGS. 5 through 8.

At 1410 the UE 115 may categorize, by TTI duration, the TTIs of the setof CCs into respective groups of TTIs. The operations of 1410 may beperformed according to the methods described herein. In certainexamples, aspects of the operations of 1410 may be performed by a UE TTImanager as described with reference to FIGS. 5 through 8.

At 1415 the UE 115 may identify a reserved power for each respectivegroup of TTIs of the set of CCs based on the received power reservationinformation. The operations of 1415 may be performed according to themethods described herein. In certain examples, aspects of the operationsof 1415 may be performed by a UE reserved power manager as describedwith reference to FIGS. 5 through 8.

At 1420 the UE 115 may identify an additional reserved power indicatedby the power reservation information. The operations of 1420 may beperformed according to the methods described herein. In certainexamples, aspects of the operations of 1420 may be performed by areserved power manager as described with reference to FIGS. 5 through 8.

At 1425 the UE 115 may determine a total transmit power based on a sumof the reserved powers. The operations of 1425 may be performedaccording to the methods described herein. In certain examples, aspectsof the operations of 1425 may be performed by a transmission powermanager as described with reference to FIGS. 5 through 8.

At 1430 the UE 115 may determine a maximum transmit power limit based onthe sum of the reserved powers, where a sum of the total transmit powerand the additional reserved power is less than or equal to the maximumtransmit power limit. The operations of 1430 may be performed accordingto the methods described herein. In certain examples, aspects of theoperations of 1430 may be performed by a transmission power manager asdescribed with reference to FIGS. 5 through 8.

At 1435 the UE 115 may transmit during the TTIs of the set of CCs usinga transmit power that is less than the determined maximum transmit powerlimit. The operations of 1435 may be performed according to the methodsdescribed herein. In certain examples, aspects of the operations of 1435may be performed by a uplink transmission component as described withreference to FIGS. 5 through 8.

FIG. 15 shows a flowchart illustrating a method 1500 for powerreservation and dropping rules for TTIs in accordance with aspects ofthe present disclosure. The operations of method 1500 may be implementedby a UE 115 or its components as described herein. For example, theoperations of method 1500 may be performed by a UE communicationsmanager as described with reference to FIGS. 5 through 8. In someexamples, a UE 115 may execute a set of codes to control the functionalelements of the device to perform the functions described below.Additionally or alternatively, the UE 115 may perform aspects of thefunctions described below using special-purpose hardware.

At 1505 the UE 115 may receive, from a base station 105, powerreservation information for TTIs to be used with a set of CCs of a CAmode. The operations of 1505 may be performed according to the methodsdescribed herein. In certain examples, aspects of the operations of 1505may be performed by a transmission power manager as described withreference to FIGS. 5 through 8.

At 1510 the UE 115 may categorize, by TTI duration, the TTIs of the setof CCs into respective groups of TTIs. The operations of 1510 may beperformed according to the methods described herein. In certainexamples, aspects of the operations of 1510 may be performed by a UE TTImanager as described with reference to FIGS. 5 through 8.

At 1515 the UE 115 may identify a reserved power for each respectivegroup of TTIs of the set of CCs based on the received power reservationinformation. The operations of 1515 may be performed according to themethods described herein. In certain examples, aspects of the operationsof 1515 may be performed by a UE reserved power manager as describedwith reference to FIGS. 5 through 8.

At 1520 the UE 115 may determine a maximum transmit power limit based ona sum of the reserved powers. The operations of 1520 may be performedaccording to the methods described herein. In certain examples, aspectsof the operations of 1520 may be performed by a transmission powermanager as described with reference to FIGS. 5 through 8.

At 1525 the UE 115 may determine a content to be transmitted on each CCof the set of CCs and during each respective group of TTIs. Theoperations of 1525 may be performed according to the methods describedherein. In certain examples, aspects of the operations of 1525 may beperformed by a content manager as described with reference to FIGS. 5through 8.

At 1530 the UE 115 may scale a transmit power for each respective groupof TTIs based on a priority of the content. The operations of 1530 maybe performed according to the methods described herein. In certainexamples, aspects of the operations of 1530 may be performed by atransmission power manager as described with reference to FIGS. 5through 8.

At 1535 the UE 115 may transmit during the TTIs of the set of CCs usinga transmit power that is less than the determined maximum transmit powerlimit. The operations of 1535 may be performed according to the methodsdescribed herein. In certain examples, aspects of the operations of 1535may be performed by a uplink transmission component as described withreference to FIGS. 5 through 8.

FIG. 16 shows a flowchart illustrating a method 1600 for powerreservation and dropping rules for TTIs in accordance with aspects ofthe present disclosure. The operations of method 1600 may be implementedby a base station 105 or its components as described herein. Forexample, the operations of method 1600 may be performed by a basestation communications manager as described with reference to FIGS. 9through 12. In some examples, a base station 105 may execute a set ofcodes to control the functional elements of the device to perform thefunctions described below. Additionally or alternatively, the basestation 105 may perform aspects of the functions described below usingspecial-purpose hardware.

At 1605 the base station 105 may identify TTIs of a set of CCs of a CAmode. The operations of 1605 may be performed according to the methodsdescribed herein. In certain examples, aspects of the operations of 1605may be performed by a base station TTI manager as described withreference to FIGS. 9 through 12.

At 1610 the base station 105 may categorize, by TTI duration, the TTIsof the set of CCs into respective groups of TTIs. The operations of 1610may be performed according to the methods described herein. In certainexamples, aspects of the operations of 1610 may be performed by a basestation TTI manager as described with reference to FIGS. 9 through 12.

At 1615 the base station 105 may determine a reserved power for eachrespective group of TTIs of the set of CCs based on the TTI duration.The operations of 1615 may be performed according to the methodsdescribed herein. In certain examples, aspects of the operations of 1615may be performed by a base station reserved power manager as describedwith reference to FIGS. 9 through 12.

At 1620 the base station 105 may transmit, to a UE 115, powerreservation information that indicates the reserved power for eachrespective group of TTIs. The operations of 1620 may be performedaccording to the methods described herein. In certain examples, aspectsof the operations of 1620 may be performed by a power reservationcomponent as described with reference to FIGS. 9 through 12.

FIG. 17 shows a flowchart illustrating a method 1700 for powerreservation and dropping rules for TTIs in accordance with aspects ofthe present disclosure. The operations of method 1700 may be implementedby a base station 105 or its components as described herein. Forexample, the operations of method 1700 may be performed by a basestation communications manager as described with reference to FIGS. 9through 12. In some examples, a base station 105 may execute a set ofcodes to control the functional elements of the device to perform thefunctions described below. Additionally or alternatively, the basestation 105 may perform aspects of the functions described below usingspecial-purpose hardware.

At 1705 the base station 105 may identify TTIs of a set of CCs of a CAmode. The operations of 1705 may be performed according to the methodsdescribed herein. In certain examples, aspects of the operations of 1705may be performed by a base station TTI manager as described withreference to FIGS. 9 through 12.

At 1710 the base station 105 may categorize, by TTI duration, the TTIsof the set of CCs into respective groups of TTIs. The operations of 1710may be performed according to the methods described herein. In certainexamples, aspects of the operations of 1710 may be performed by a basestation TTI manager as described with reference to FIGS. 9 through 12.

At 1715 the base station 105 may determine a reserved power for eachrespective group of TTIs of the set of CCs based on the TTI duration.The operations of 1715 may be performed according to the methodsdescribed herein. In certain examples, aspects of the operations of 1715may be performed by a base station reserved power manager as describedwith reference to FIGS. 9 through 12.

At 1720 the base station 105 may transmit, to a UE 115, powerreservation information that indicates the reserved power for eachrespective group of TTIs. The operations of 1720 may be performedaccording to the methods described herein. In certain examples, aspectsof the operations of 1720 may be performed by a power reservationcomponent as described with reference to FIGS. 9 through 12.

At 1725 the base station 105 may transmit the power reservationinformation to the UE via semi-static signaling or via a transmit powercontrol command. The operations of 1725 may be performed according tothe methods described herein. In certain examples, aspects of theoperations of 1725 may be performed by a power reservation component asdescribed with reference to FIGS. 9 through 12.

FIG. 18 shows a flowchart illustrating a method 1800 for powerreservation and dropping rules for TTIs in accordance with aspects ofthe present disclosure. The operations of method 1800 may be implementedby a UE 115 or its components as described herein. For example, theoperations of method 1800 may be performed by a UE communicationsmanager as described with reference to FIGS. 5 through 8. In someexamples, a UE 115 may execute a set of codes to control the functionalelements of the device to perform the functions described below.Additionally or alternatively, the UE 115 may perform aspects of thefunctions described below using special-purpose hardware.

At 1805 the UE 115 may receive, from a base station, power reservationinformation for a set of CCs of a CA mode, respective CCs of the set ofCCs associated with a first PUCCH group or a second PUCCH group. Theoperations of 1805 may be performed according to the methods describedherein. In certain examples, aspects of the operations of 1805 may beperformed by a transmission power manager as described with reference toFIGS. 5 through 8.

At 1810 the UE 115 may identify a reserved power for each of the firstPUCCH group and the second PUCCH group based on the received powerreservation information. The operations of 1810 may be performedaccording to the methods described herein. In certain examples, aspectsof the operations of 1810 may be performed by a PUCCH group manager asdescribed with reference to FIGS. 5 through 8.

At 1815 the UE 115 may determine a maximum transmit power limit based ona sum of the reserved powers. The operations of 1815 may be performedaccording to the methods described herein. In certain examples, aspectsof the operations of 1815 may be performed by a transmission powermanager as described with reference to FIGS. 5 through 8.

At 1820 the UE 115 may transmit on the set of CCs using a transmit powerthat is less than or equal to the determined maximum transmit powerlimit. The operations of 1820 may be performed according to the methodsdescribed herein. In certain examples, aspects of the operations of 1820may be performed by a uplink transmission component as described withreference to FIGS. 5 through 8.

FIG. 19 shows a flowchart illustrating a method 1900 for powerreservation and dropping rules for TTIs in accordance with aspects ofthe present disclosure. The operations of method 1900 may be implementedby a base station 105 or its components as described herein. Forexample, the operations of method 1900 may be performed by a basestation communications manager as described with reference to FIGS. 9through 12. In some examples, a base station 105 may execute a set ofcodes to control the functional elements of the device to perform thefunctions described below. Additionally or alternatively, the basestation 105 may perform aspects of the functions described below usingspecial-purpose hardware.

At 1905 the base station 105 may identify a set of CCs of a CA mode,respective CCs of the set of CCs being associated with a first PUCCHgroup or a second PUCCH group. The operations of 1905 may be performedaccording to the methods described herein. In certain examples, aspectsof the operations of 1905 may be performed by a CC manager as describedwith reference to FIGS. 9 through 12.

At 1910 the base station 105 may determine a reserved power for each ofthe first PUCCH group and the second PUCCH group. The operations of 1910may be performed according to the methods described herein. In certainexamples, aspects of the operations of 1910 may be performed by a basestation reserved power manager as described with reference to FIGS. 9through 12.

At 1915 the base station 105 may transmit, to a UE, power reservationinformation that indicates the reserved power for each of the firstPUCCH group and the second PUCCH group. The operations of 1915 may beperformed according to the methods described herein. In certainexamples, aspects of the operations of 1915 may be performed by a powerreservation component as described with reference to FIGS. 9 through 12.

It should be noted that the methods described above describe possibleimplementations, and that the operations and the steps may be rearrangedor otherwise modified and that other implementations are possible.Further, aspects from two or more of the methods may be combined.

Techniques described herein may be used for various wirelesscommunications systems such as code division multiple access (CDMA),time division multiple access (TDMA), frequency division multiple access(FDMA), orthogonal frequency division multiple access (OFDMA), singlecarrier frequency division multiple access (SC-FDMA), and other systems.A CDMA system may implement a radio technology such as CDMA2000,Universal Terrestrial Radio Access (UTRA), etc. CDMA2000 covers IS-2000,IS-95, and IS-856 standards. IS-2000 Releases may be commonly referredto as CDMA2000 1×, 1×, etc. IS-856 (TIA-856) is commonly referred to asCDMA2000 1×EV-DO, High Rate Packet Data (HRPD), etc. UTRA includesWideband CDMA (WCDMA) and other variants of CDMA. A TDMA system mayimplement a radio technology such as Global System for MobileCommunications (GSM).

An OFDMA system may implement a radio technology such as Ultra MobileBroadband (UMB), Evolved UTRA (E-UTRA), Institute of Electrical andElectronics Engineers (IEEE) 802.11 (Wi-Fi), IEEE 802.16 (WiMAX), IEEE802.20, Flash-OFDM, etc. UTRA and E-UTRA are part of Universal MobileTelecommunications System (UMTS). LTE and LTE-A are releases of UMTSthat use E-UTRA. UTRA, E-UTRA, UMTS, LTE, LTE-A, NR, and GSM aredescribed in documents from the organization named “3rd GenerationPartnership Project” (3GPP). CDMA2000 and UMB are described in documentsfrom an organization named “3rd Generation Partnership Project 2”(3GPP2). The techniques described herein may be used for the systems andradio technologies mentioned above as well as other systems and radiotechnologies. While aspects of an LTE or an NR system may be describedfor purposes of example, and LTE or NR terminology may be used in muchof the description, the techniques described herein are applicablebeyond LTE or NR applications.

A macro cell generally covers a relatively large geographic area (e.g.,several kilometers in radius) and may allow unrestricted access by UEs115 with service subscriptions with the network provider. A small cellmay be associated with a lower-powered base station 105, as comparedwith a macro cell, and a small cell may operate in the same or different(e.g., licensed, unlicensed, etc.) frequency bands as macro cells. Smallcells may include pico cells, femto cells, and micro cells according tovarious examples. A pico cell, for example, may cover a small geographicarea and may allow unrestricted access by UEs 115 with servicesubscriptions with the network provider. A femto cell may also cover asmall geographic area (e.g., a home) and may provide restricted accessby UEs 115 having an association with the femto cell (e.g., UEs 115 in aclosed subscriber group (CSG), UEs 115 for users in the home, and thelike). An eNB for a macro cell may be referred to as a macro eNB. An eNBfor a small cell may be referred to as a small cell eNB, a pico eNB, afemto eNB, or a home eNB. An eNB may support one or multiple (e.g., two,three, four, and the like) cells, and may also support communicationsusing one or multiple component carriers.

The wireless communications system 100 or systems described herein maysupport synchronous or asynchronous operation. For synchronousoperation, the base stations 105 may have similar frame timing, andtransmissions from different base stations 105 may be approximatelyaligned in time. For asynchronous operation, the base stations 105 mayhave different frame timing, and transmissions from different basestations 105 may not be aligned in time. The techniques described hereinmay be used for either synchronous or asynchronous operations.

Information and signals described herein may be represented using any ofa variety of different technologies and techniques. For example, data,instructions, commands, information, signals, bits, symbols, and chipsthat may be referenced throughout the above description may berepresented by voltages, currents, electromagnetic waves, magneticfields or particles, optical fields or particles, or any combinationthereof.

The various illustrative blocks and modules described in connection withthe disclosure herein may be implemented or performed with ageneral-purpose processor, a DSP), an ASIC, a FPGA or other programmablelogic device (PLD), discrete gate or transistor logic, discrete hardwarecomponents, or any combination thereof designed to perform the functionsdescribed herein. A general-purpose processor may be a microprocessor,but in the alternative, the processor may be any conventional processor,controller, microcontroller, or state machine. A processor may also beimplemented as a combination of computing devices (e.g., a combinationof a DSP and a microprocessor, multiple microprocessors, one or moremicroprocessors in conjunction with a DSP core, or any other suchconfiguration).

The functions described herein may be implemented in hardware, softwareexecuted by a processor, firmware, or any combination thereof. Ifimplemented in software executed by a processor, the functions may bestored on or transmitted over as one or more instructions or code on acomputer-readable medium. Other examples and implementations are withinthe scope of the disclosure and appended claims. For example, due to thenature of software, functions described above can be implemented usingsoftware executed by a processor, hardware, firmware, hardwiring, orcombinations of any of these. Features implementing functions may alsobe physically located at various positions, including being distributedsuch that portions of functions are implemented at different physicallocations.

Computer-readable media includes both non-transitory computer storagemedia and communication media including any medium that facilitatestransfer of a computer program from one place to another. Anon-transitory storage medium may be any available medium that can beaccessed by a general purpose or special purpose computer. By way ofexample, and not limitation, non-transitory computer-readable media mayinclude RAM, ROM, electrically erasable programmable read only memory(EEPROM), flash memory, compact disk (CD) ROM or other optical diskstorage, magnetic disk storage or other magnetic storage devices, or anyother non-transitory medium that can be used to carry or store desiredprogram code means in the form of instructions or data structures andthat can be accessed by a general-purpose or special-purpose computer,or a general-purpose or special-purpose processor. Also, any connectionis properly termed a computer-readable medium. For example, if thesoftware is transmitted from a website, server, or other remote sourceusing a coaxial cable, fiber optic cable, twisted pair, digitalsubscriber line (DSL), or wireless technologies such as infrared, radio,and microwave, then the coaxial cable, fiber optic cable, twisted pair,DSL, or wireless technologies such as infrared, radio, and microwave areincluded in the definition of medium. Disk and disc, as used herein,include CD, laser disc, optical disc, digital versatile disc (DVD),floppy disk and Blu-ray disc where disks usually reproduce datamagnetically, while discs reproduce data optically with lasers.Combinations of the above are also included within the scope ofcomputer-readable media.

As used herein, including in the claims, “or” as used in a list of items(e.g., a list of items prefaced by a phrase such as “at least one of” or“one or more of”) indicates an inclusive list such that, for example, alist of at least one of A, B, or C means A or B or C or AB or AC or BCor ABC (i.e., A and B and C). Also, as used herein, the phrase “basedon” shall not be construed as a reference to a closed set of conditions.For example, an exemplary step that is described as “based on conditionA” may be based on both a condition A and a condition B withoutdeparting from the scope of the present disclosure. In other words, asused herein, the phrase “based on” shall be construed in the same manneras the phrase “based at least in part on.”

In the appended figures, similar components or features may have thesame reference label. Further, various components of the same type maybe distinguished by following the reference label by a dash and a secondlabel that distinguishes among the similar components. If just the firstreference label is used in the specification, the description isapplicable to any one of the similar components having the same firstreference label irrespective of the second reference label, or othersubsequent reference label.

The description set forth herein, in connection with the appendeddrawings, describes example configurations and does not represent allthe examples that may be implemented or that are within the scope of theclaims. The term “exemplary” used herein means “serving as an example,instance, or illustration,” and not “preferred” or “advantageous overother examples.” The detailed description includes specific details forthe purpose of providing an understanding of the described techniques.These techniques, however, may be practiced without these specificdetails. In some instances, well-known structures and devices are shownin block diagram form in order to avoid obscuring the concepts of thedescribed examples.

The description herein is provided to enable a person skilled in the artto make or use the disclosure. Various modifications to the disclosurewill be readily apparent to those skilled in the art, and the genericprinciples defined herein may be applied to other variations withoutdeparting from the scope of the disclosure. Thus, the disclosure is notlimited to the examples and designs described herein, but is to beaccorded the broadest scope consistent with the principles and novelfeatures disclosed herein.

What is claimed is:
 1. A method for wireless communication, comprising:receiving, from a base station, power reservation information fortransmission time intervals (TTIs) to be used with a set of componentcarriers (CCs) of a carrier aggregation (CA) mode; categorizing, by TTIduration, the TTIs of the set of CCs into respective groups of TTIs;identifying a reserved power for each respective group of TTIs of theset of CCs based on the received power reservation information;determining a maximum transmit power limit based at least in part on asum of the reserved powers; dropping a transmission based at least inpart on content or length of a first TTI of the TTIs; allocatingtransmit power based at least in part on the dropping; and transmittingduring the TTIs of the set of CCs using the allocated transmit powerthat is less than the determined maximum transmit power limit.
 2. Themethod of claim 1, wherein dropping the transmission is based at leastin part on the content of the first TTI, and wherein the content of thefirst TTI comprises a physical uplink control channel (PUCCH), or aphysical uplink shared channel (PUSCH) with uplink control information(UCI), or a PUSCH without UCI, or a reference signal.
 3. The method ofclaim 1, wherein dropping the transmission is based at least in part onthe length of the first TTI, and wherein the length of the first TTI isa subframe or a slot.
 4. The method of claim 1, wherein dropping thetransmission comprises: dropping at least a portion of the first TTI ofthe TTIs based at least in part on at least one dropping rule.
 5. Themethod of claim 1, wherein dropping the transmission comprises: droppingat least a portion of the first TTI of the TTIs based at least in parton a priority of content scheduled to be transmitted in the first TTI.6. The method of claim 1, wherein dropping the transmission comprises:dropping at least a portion of the first TTI of the TTIs based at leastin part on a duration of the first TTI.
 7. The method of claim 1,further comprising: determining first content of a first control channelgroup scheduled to be transmitted during the first TTI of the TTIs andsecond content of a second control channel group scheduled to betransmitted during a second TTI of the TTIs, wherein dropping thetransmission comprises dropping at least a portion of the first TTI orthe second TTI based at least in part on a priority of the first contentand a priority of the second content.
 8. The method of claim 1, whereindropping the transmission comprises: dropping at least a portion of thefirst TTI of the TTIs based at least in part on whether contentscheduled to be transmitted in the first TTI comprises uplink controlinformation.
 9. The method of claim 1, wherein dropping the transmissioncomprises: dropping at least a portion of the first TTI of the TTIsbased at least in part on whether a signal scheduled to be transmittedwithin the first TTI is a reference signal.
 10. The method of claim 1,wherein receiving the power reservation information further comprises:receiving the power reservation information via semi-static signalingfrom the base station or via a transmit power control command from thebase station.
 11. The method of claim 10, wherein receiving the powerreservation information further comprises receiving the powerreservation information via the semi-static signaling from the basestation, the semi-static signaling comprising radio resource control(RRC) messaging.
 12. The method of claim 1, wherein determining themaximum transmit power limit comprises: determining a total transmitpower based on the sum of the reserved powers; and identifying anadditional reserved power indicated by the power reservationinformation, wherein a sum of the total transmit power and theadditional reserved power is less than or equal to the maximum transmitpower limit.
 13. The method of claim 12, further comprising: allocatingthe additional reserved power to a first TTI group of the respectivegroups of TTIs based at least in part on a TTI priority, wherein a totalpower of the first TTI group is greater than a reserved power of thefirst TTI group.
 14. The method of claim 13, wherein the TTIs of thefirst TTI group have a first TTI duration that is shorter than a secondTTI duration of another TTI.
 15. The method of claim 12, furthercomprising: allocating the additional reserved power to a first TTIgroup of the respective groups of TTIs, a reserved power of the firstTTI group being exceeded before other respective groups of TTIs exceedother respective reserved powers, wherein a total power of the first TTIgroup is greater than the reserved power of the first TTI group.
 16. Themethod of claim 1, further comprising: determining a content to betransmitted on each CC of the set of CCs and during each respectivegroup of TTIs; and scaling a transmit power for each respective group ofTTIs based at least in part on a priority of the content.
 17. The methodof claim 16, further comprising: identifying two of more CCs of the setof CCs that transmit a same content using a same TTI duration; andscaling the transmit power for the two or more CCs based at least inpart on a priority of the content.
 18. The method of claim 16, whereinthe content comprises a physical uplink control channel (PUCCH), or aphysical uplink shared channel (PUSCH) comprising uplink controlinformation (UCI), or a PUSCH that does not include UCI, or a soundingreference signal (SRS).
 19. The method of claim 1, further comprising:identifying a collision between the first TTI having a first durationand a second TTI having a second duration to be transmitted on the setof CCs, the second duration being less than the first duration;determining a priority of the first TTI and the second TTI; dropping oneor more symbol periods of the first TTI or the second TTI having alowest priority based at least in part on the determined priority; andallocating a reserved power to the first TTI or the second TTI having ahighest priority based at least in part on the determined priority. 20.An apparatus for wireless communication, comprising: a processor, memoryin electronic communication with the processor; and instructions storedin the memory and executable by the processor to cause the apparatus to:receive, from a base station, power reservation information fortransmission time intervals (TTIs) to be used with a set of componentcarriers (CCs) of a carrier aggregation (CA) mode; categorize, by TTIduration, the Tris of the set of CCs into respective groups of TTIs;identify a reserved power for each respective group of TTIs of the setof CCs based on the received power reservation information; determine amaximum transmit power limit based at least in part on a sum of thereserved powers; drop a transmission based at least in part on contentof length of a first TTI of the TTIs; allocate transmit power based atleast in part on the dropping; and transmit during the TTIs of the setof CCs using the allocated transmit power that is less than thedetermined maximum transmit power limit.
 21. The apparatus of claim 20,wherein the instructions executable by the processor to drop thetransmission are based at least in part on the content of the first TTI,and wherein the content of the first TTI comprises a physical uplinkcontrol channel (PUCCH), or a physical uplink shared channel (PUSCH)with uplink control information (UCI), or a PUSCH without UCI, or areference signal.
 22. The apparatus of claim 20, wherein theinstructions executable by the processor to drop the transmission arebased at least in part on the length of the first TTI, and wherein thelength of the first TTI is a subframe or a slot.
 23. The apparatus ofclaim 20, wherein the instructions to drop the transmission are furtherexecutable by the processor to cause the apparatus to: drop at least aportion of the first TTI of the TTIs based at least in part on at leastone dropping rule.
 24. The apparatus of claim 20, wherein theinstructions to drop the transmission are further executable by theprocessor to cause the apparatus to: drop at least a portion of thefirst TTI of the TTIs based at least in part on a priority of contentscheduled to be transmitted in the first TTI.
 25. The apparatus of claim20, wherein the instructions to drop the transmission are furtherexecutable by the processor to cause the apparatus to: drop at least aportion of the first TTI of the TTIs based at least in part on aduration of the first TTI.
 26. The apparatus of claim 20, wherein theinstructions are further executable by the processor to cause theapparatus to: determine first content of a first control channel groupscheduled to be transmitted during the first TTI of the TTIs and secondcontent of a second control channel group scheduled to be transmittedduring a second TTI of the TTIs, wherein the instructions to drop thetransmission are further executable by the processor to cause theapparatus to drop at least a portion of the first TTI or the second TTIbased at least in part on a priority of the first content and a priorityof the second content.
 27. The apparatus of claim 20, wherein theinstructions to drop the transmission are further executable by theprocessor to cause the apparatus to: drop at least a portion of thefirst TTI of the TTIs based at least in part on whether contentscheduled to be transmitted in the first TTI comprises uplink controlinformation.
 28. The apparatus of claim 20, wherein the instructions todrop the transmission are further executable by the processor to causethe apparatus to: drop at least a portion of the first TTI of the TTIsbased at least in part on whether a signal scheduled to be transmittedwithin the first TTI is a reference signal.
 29. The apparatus of claim20, wherein the instructions to receive the power reservationinformation are further executable by the processor to cause theapparatus to: receive the power reservation information via semi-staticsignaling from the base station or via a transmit power control commandfrom the base station.
 30. The apparatus of claim 20, wherein theinstructions to determine the maximum transmit power limit areexecutable by the processor to cause the apparatus to: determine a totaltransmit power based on the sum of the reserved powers; and identify anadditional reserved power indicated by the power reservationinformation, wherein a sum of the total transmit power and theadditional reserved power is less than or equal to the maximum transmitpower limit.
 31. The apparatus of claim 30, wherein the instructions arefurther executable by the processor to cause the apparatus to: allocatethe additional reserved power to a first TTI group of the respectivegroups of TTIs based at least in part on a TTI priority, wherein a totalpower of the first TTI group is greater than a reserved power of thefirst TTI group.
 32. The apparatus of claim 31, wherein the TTIs of thefirst TTI group have a first TTI duration that is shorter than a secondTTI duration of another TTI.
 33. The apparatus of claim 30, wherein theinstructions are further executable by the processor to cause theapparatus to: allocate the additional reserved power to a first TTIgroup of the respective groups of TTIs, a reserved power of the firstTTI group being exceeded before other respective groups of TTIs exceedother respective reserved powers, wherein a total power of the first TTIgroup is greater than the reserved power of the first TTI group.
 34. Theapparatus of claim 20, wherein the instructions are further executableby the processor to cause the apparatus to: determine a content to betransmitted on each CC of the set of CCs and during each respectivegroup of TTIs; and scale a transmit power for each respective group ofTTIs based at least in part on a priority of the content.
 35. Theapparatus of claim 34, wherein the instructions are further executableby the processor to cause the apparatus to: identify two of more CCs ofthe set of CCs that transmit a same content using a same TTI duration;and scale the transmit power for the two or more CCs based at least inpart on a priority of the content.
 36. The apparatus of claim 34,wherein the content comprises a physical uplink control channel (PUCCH),or a physical uplink shared channel (PUSCH) comprising uplink controlinformation (UCI), or a PUSCH that does not include UCI, or a soundingreference signal (SRS).
 37. The apparatus of claim 20, wherein theinstructions are further executable by the processor to cause theapparatus to: identify a collision between the first TTI having a firstduration and a second TTI having a second duration to be transmitted onthe set of CCs, the second duration being less than the first duration;determine a priority of the first TTI and the second TTI; drop one ormore symbol periods of the first TTI or the second TTI having a lowestpriority based at least in part on the determined priority; and allocatea reserved power to the first TTI or the second TTI having a highestpriority based at least in part on the determined priority.